Have a 1980 truck, 6 cyl, 250 ci with 48,000 actual miles. The 6 cyl is a cripple and both the engine and transmission need rebuilding. I plan to replace with a 307 ci that has a blown transmission attached. My question is will the transmission on the 250 ci work with the 307 engine? Are there internal differences between the 6 cyl trans. and the 307 trans. that I need to be aware of? Thanks for any advice.