Some guys where?? I don't think it was here....
I think given what you're into at this point you might want to investigate the return policy on the reman.
I'd wonder what the quality of the reman is if it's less than the machine work for the ag block... or mabey find another quote for the machine work...
I think if you look at the truck engine you may find that the crank has more bolt holes than the ag crank so that won't bolt a flywheel/hub. There's going to be significant plumbing to the intake and probably exhaust. Fuel plumbing will be completly different for the Bosch pump on the truck... and the list goes on.
You may also run into difficulty fitting the front bolster of the tractor once the engine is bolted in place. You say it's a rear sump engine? I know the 9600 had a mid sump. Later ag engines had a front pump with a mid sump I think... so that front pump off the timing gears causes an interference with the front bolster of the tractor.
Anyone that thinks this is a quick easy project and a cheap fix is generally sadly mistaken. It may be a project of interest to some... but I don't think it would be driven by economics or expediency.