[William]

First of all you will need a bb crossmamber if the car has a T400; manual trans can be made to work with the sb crossmember.

67-68, 69 frame brackets and motor mounts don't interchange. If you have 67-68 bb frame brackets you must use 67-68 motor mounts. 69 bb frame brackets must use 69 motor mounts. A bb will fit on sb brackets but exhaust, power steering, radiator, etc. will prove to be a headache.

I believe all crate bbs use a 5 quart pan which does not fit a Camaro/Chevelle chassis. Chevy doesn't offer a 4 quart pan for later bbs but the aftermarket does.