To the best of my knowledge the only difference in the '60's and '70's bellhousings was the bolt pattern on the engine side. There is a Chevy pattern and a Buick, Olds, Pontiac (BOP) pattern. I personally have bolted a 4-speed Saginaw to a bell that had a 3-speed Saginaw originally. Muncie should be no problem.
My car was an original I6 with the three in the tree saginaw 3spd. I now have the GMPP 350HO, AutoGear M22 and I am still using the original bellhousing. Fit with no problems. I did, however, have to modify the inspection cover to fit around the one piece rear seal of the motor.
1969, X-44, Export Model, Hugger Orange, Std. Int., BC Rear(soon to be a BT 12 bolt), PDB, GMPP 350HO, M22 Supercase, SSM Lift Bars, AirGap, Holley 750, FlowMaster American Thunder Exhaust, FlowTech Headers
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