Will a 350 Chevy engine bolt up to transmission that housed 3.8 Buick v-6?
No, a 350 Chevy engine will not bolt up to a transmission designed for a Buick 3.8L V6. The bolt patterns on the engine blocks and the transmission bell housings are completely different. They are not interchangeable. You'll need a transmission appropriate for the 350 Chevy, such as a TH350, TH400, 700R4, or a modern equivalent.