Any body know for sure if a 200r4(spare unit out of 88 Chevy caprice with 307)will bolt to 75 Olds 350 engine? I assume yes..but aint sure
Yes it has the appropriate BOP bellhousing pattern. The 307 (Olds) from the Chevy and the 350 Olds have the same bellhousing pattern.
For a few years, GM had a 200r4 with a 'dual pattern' that would accept BOP, Chevy and even Cadillac bolt patterns. Thet were pretty common.