A lot of what you'll be looking at wil be one-off stuff. AMC put a V8 in them, so there's more than ample room, but all the mounts will have to be custom. I'd say get the basic engine mounts from a street rod shop, and then use shorty or block hugger headers that you can simply attach single downpipes to to start the exhaust system.
I'm not mean. You're just a wuss.