A lot, probably most of the engines i've built have been a mixture of parts.
IE, early cranks into later cases etc etc. The only correct way of doing the
job is to measure it. It's close enough to use the flywheel as the guide, just
measure the width and halve it, mark a line around it, then put a piece of
shim into the joint faces of the cases and line that up.with the mark. That
will then allow you to move the crank back and forth with a clock on one end.
Thus establishing the shim size.
It's not that critical but makes for a sweeter engine if all is lined up. Doing the
job with mixed parts can be a little more complicated. With the later cranks
and roller setup you have to setup for minimal end float or make up TS thrust
washers etc. If all your parts line up with the book, just follow the instructions there.
The crank and cases are from the same motor. Connecting rods are new cromoly from map cycles, srm oil pump and newby clutch/belt drive. The head and cylinders are from other years/models. The cylinders I'm using were in better shape than the ones original to the motor and I'm putting a thunderbolt head on instead of the lightning. all those things shouldn't be an issue now though (I'm sure will be later...)
I rebuilt the 68 motor in my bike now almost ten years ago and it ran solid for many thousand miles (until return oil line popped off on my way to work this spring)
I may seem dense and repetitive in my questions, sorry for that, I just want to make sure this motor will be as solid as an a65 can be. And that I'm understanding things absolutely correct.
all the tips, tricks and ideas for building it are greatly appreciated!!!