78 t/a auto to 4 speed tranny swap

[BAD BIRD]

I am swapping from a turbo 350 to a Muncie M-20 and I am not sure what size clutch I should buy 10 & 1/2 '' or 11'' can anyone help? the car is a 1978 the muncie is 1971

 

[92 Sunbird LE]

Measure your bellhousing and flywheel , 14" diameter flywheel uses the 11" clutch, 12.75" flywheel uses the 10.5" . Some bellhousings are smaller and wont take the larger flywheel.


The larger is for High Performance.

Doug in P.R.