Just going through this myself.
Great place to start is the IPC manual so you can see what parts are used.
For example:
http://www.redskyventures.org/doc/ce...e-pc-306-2.pdf
Also the TCDS is helpful to trace back the engine.
For example I have an O-360-C2E which traces back to the A1A and the above parts catalog shows that C2E has the same crank (hollow) and the same front bearing (With the oil holes). Also the idler gears in the acc case are correct.
Also shows that the prop governor adaptor can be installed with the gear from outside without pulling the acc case.
So I am good, still putting together the parts to pull this off though ;-)
Each of these engines seem different so do some more research.
And let us know how it turns out.