Motor Mounts & Tranny question

Hey guys. So I've found a car I'm looking at purchasing and done some searching but can't find an answer to my questions. It is a 4 speed car that currently has a 340 (not numbers matching). Well I want to drop the 340 and swap in a slant. I'm probably the first person ever to take out a 340 for a slant, but I already have a 340 car and want a slant. My question is will the slant drop into the mounts already there, or what do I have to do to drop in the slant. Other question is, will the slant bolt up to the a833? Thanks.