Any Chevrolet bell housing will fit, so you have a wide choice of transmissions. No change to the crank will be needed. Spec the flex plate to the same tooth count as the flywheel so the starter fits assuming the starter bolts to the engine. Some used a three bolt starter that fit the trans housing. I believe the common 168 tooth flex plate is standard, 153 is the small diameter one.
The 700r4 is a big heavy trans that works great, for a lighter 4 speed you can use a 200r4 which is based off the T350.
Joe
