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