I was just dodging raindrops in the driveway, attempting to install the flywheel from my early slant six ('60's) onto a later slant six (1975). It appears there is a ridge on the end of the crankshaft preventing this. Now what? adapter flange, mill out flywheel?

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/6 '67 Barracuda convertible, electronic ignition, 4-OD, street cam, SBP KH discs, 3.55 SG 7.25" 1" t-bars. Bilstein.
340 '67 fastback, Doug Nash 5-speed.
1988 Toyota pickup work truck

The bolt pattern is different as well. You need the right flywheel...or motor.

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Yeah....Im the one who destroyed this rare, vintage automobile.....

figures...