I'm working on installing a 4.3L Chevy v6 in my '76 vega. It has the original 5 speed tranny. I purchased a v8 bellhousing from a Monza of the same vintage since I'll be using the same cable clutch arrangement. I fabricated new motor mounts to keep the driveline stock from the tranny on back. I haven't seen this particular swap done before although I'm sure there are probably some out there.