Im restoring a 1970 chevelle malibu. It's a 307 small block with a powerglide. I have already taken out that engine. what Iam having trouble on is dont know what exaclty to change or upgrade.to make the bb fit. I just purchased a 396 bbc with a th-350 that came off a 1969 chevelle. What do i need to change to have that combo fit right .. would apriciate any help and if possible email me with your answers....(prez600@hotmail.com) thanks