Rolling dices,
WATCH OUT changing flywheels on the 194-230-250-292 at just about the date you mention. Bolt sizes change! If the bolts are the same size, ok, but do, not use a flywheel with large bolt holes on a crank for the smaller bolts. The small bolt flywheels can be drilled out by a machine shop. I am pretty sure that there were three different bolt sizes, 7/16, 1/2, and 9/16, but don't quote me on that. Measure and check stuff. The time you spend checking is never a waste compared to another crankshaft!
As a matter of passing, I think that the 250 engine is just about the best inline 6 Chevrolet ever built. Keep oil in them and they'll go forever.
As Lonnie said, don't forget the pilot bearing.
best wishes,
Les
