Engine swap - will trans fit???

We have a 78 Trans Am with a 79 Olds 403. It is currently mounted to a TH350 trans. The 403 is burning too much oil so we are thinking of installing the Chevy 350 we have. The 350 is a 1975 block and was hooked up to a TH350 in a Camaro. Will this block line up with any TH350? We know we will need new motor mounts, what style do we need?

That should be the same Unless you have a U block trans case.