307 to 350 Motor Swap

[70Velle]

I recently inherited a 70 chevelle. It only had the 307 block with frozen pistons so I choose to put in a 73 35o. Should I purchase 350 frame and motor mounts to ensure a positive match and easy swap out? Also had a 2 speed powerglide, but going with 350 tranny as well, any adjustments need to be made or will it slide right in. Will post pics later.