1850 perkins engine swap?

I have a 1967 oliver 1850 diesel with a spun crankshaft main bearing that ruined the crankshaft and engines cylinder block.(354U84930) I have found a local farmer with a low hour (1863hrs)1977 massey ferguson 510 combine that has a 354 perkins engine serial number 354UA65159L in it.The intake and exhaust manifold bolts appear to be the same arrangement and sequence. It does have the tin cover for the valve tappets and pushrods on the side. I have read on ytmag here that I will need to reuse my original oil pan, unplug oil galley to change oil filter sides and reuse my front timing cover with water pump.
My main concerns are if this engines serial has an "L" for lip type rear main seal.Will this style crankshaft have any issues with the original 1850 flywheel and flywheel housing that used rope crankshaft seals?
Can I just swap the injector pump auxillary drive shaft with the worm gear on it between the two engines so I have the original tachometer setup?
And the last question regards injector pump.It is set to idle at 550 rpm and high no load of 2090 rpm. To adjust the high idle is all I need to do is loosen up the throttle stop on the outside of injector pump.Or are there weights and springs inside the injector pump that will need to be changed?
Thank you all in advance for the help and if there is anything else I need to look at before buying this engine please let me know...

I had a similar situation, and used a 354-T out of a 750 in my 1850. Look thru the archives, as I have posted many times about the switch over. If you have questions, e-mail me. I was told that the govener needs to changed to work at all engine speeds for the tractor because the combine is set for idle and full throttle only. Mine has the lip seal, no problems. The holes for the intake and exhaust manifolds were drilled on the wrong side to use the Oliver manifolds on the MF motor, you may have to have the head redrilled? I didn't change the quill shaft, my tach drive was shot, so I got a cable for a 2-105 and a different used tach and now my tach died so I need to find another one. Contact me if you have questions. Chris

Were all these perkins engines cold blooded for starting? I see super99 has two coolant heaters on his, but I'm sure one is the original tractors and the other from the combine. I bought some oliver weights from a guy who has a 7300? White combine and he said he never left his out in the field for that reason of bad starting, any fixes? thanks chris

The flywheel from the 1850 will fit. Both
engines have the same bolt pattern on the
crank. Why worry about the rope seal just leave
the lip seal on the engine. Do not forget to
use the tube that attaches to the oil pump relief
valve so you feed the feed the oil filter on the
other side of engine(from the 1850) I have used the combine injector pump on my tractors. Some guys change the weights in the pump governor.

Perkins used two types of pistons. One has a
little lower compression for warmer areas. The
other provides a little higher compression for
northern areas. I have the part numbers in my
shop. This partially answers the cold blooded
issue. The second part is that a lot of valve
jobs resulted in a lot of valves that are
recessed to much. The third part is too many
injectors and pumps are not checked for proper
delivery and injector pattern and leakage.

One from a 510 should be a pretty easy swap. You'll see what has to be changed when you start to swap it out,but pretty much EVERYTHING from the tractor engine has to go on the combine engine.
About the only thing you don't have to change will be the injectors,injector pump and one side cover. EVERYTHING else has to be changed,including the injector lines and throttle plate on the side of the pump. Use the flywheel bolts from the tractor. The ones from the combine are too long and will punch into the rear main seal housing.

The original in my 1850 started kinda hard,but I have an engine from an 8700 White combine in it now and it starts pretty easy. I just layed it to having fewer hours on the engine and injector pump.

I agree on the valve recession 100%. But how are you counting pistons? Remember not all 354 Perkins have the same compression ratio or use the same pistons. Cranking speed also becomes important.