I don't have a picture of the bypass system but here is one (sorry it's a poor pic) from a full flow system. You can see TWO lines coming in/out of the filter base back to the block near the dipstick. The filter is a regular spin on (PH8A, FL1A, etc). A bypass will have just thinner line(s) if I remember right and there will be a vertical tube that goes in the filter from the filter base that you will see when you take the filter off. The bypass is in the block on it and in the full-flow the bypass valve is part of the oil pump.
You can convert a bypass to a full flow by drilling tapping the block for these lines but I'm not an expert at that and you'll need the full flow filter base and the oil pump with the built in bypass. You might also have to change the gear either on the end of the oil pump shaft to match your cam or replace the cam if upgrading an older block so it will mesh with the newer oil pump.
Regarding manifolds they were very similar and will interchange between blocks. WD45 and earlier D17's had different exhaust holes to mount round mufflers. Series III & IV D17/170/175 were threaded to mount a short piece of pipe to clamp on an oval muffler. The 175's had a slightly larger carb opening.
Somewhere on another forum someone had a post on the piston height measurements for the various CR's.
All these head are FLAT heads with no CC. The pistons are Power Crater design if original Allis pistons (or some aftermarket like M&W??) but most newer kits are dished and not "cratered" so the pistons make up the CC.
Questions on stroking & so forth need to go to an Allis pulling forum which there is somewhere else. I am not a puller, just a part-time farmer and long time Allis fan.
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