To the best of my knowledge, upto '87, all the flywheels for the 240 (B21/23/230)used flat flywheels that are interchangeable with each other.
In '87, the flywheels became a step style flywheel. It was also the first year for the M47 transmission. The clutch was also increased to an 9" from the 8.5".
'85 was the first year for the different clutch fork/TO bearing.
I used a pre '85 clutch fork/TO bearing on a '86 B230/M46 without a problem. Actually, I like the earlier clutch forks over the later ones.
Paul
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