Flywheel is the stock unit from the 383 HP motor out of my 68 Bee. I've measured both cranks with calipers after thoroughly cleaning and deburring the center OD were measured. That center on both is not perfectly round, about .008 difference in both as you measure the circumfrance. Some other tidbits to consider I guess would be I did get this 440 motor from my 78 truck which originally came with a 440 but along the line something happened to the block I guess and a 70 F440 stamped block was in place when I bought the truck. Cast 7/21/69. Newer cast crank in that?? Would the flywheel still fit anyway?? Whats my liability of taking that center down .020 to get it to fit?? I notice the orig motor with the orig flywheel does not have a real tight fit at that point and alignment appears to be with the bolts themselves. Does anyone know if the 10.5 flywheel bolt pattern is the same as the 11??