Some comparison pics are in order I think. Here's my buddy Josh's car with the "I don't give a shit about how it looks I just want to drift" approach.
If you use a HEI distributor, you can expect to have to bash the firewall in. Perhaps you could bash it a bit better than this though. I won't be using a HEI distributor for this very reason. Also his windsheild wiper linkage is not capable of movement anymore

I'll be using a standard diameter distributor.
What you can expect for clearance on thedriver's side.
Passenger side clearance.
Clearance around the starter area.
This shot gives you an idea of the length of the engine.
Same thing on the other side.
So basically it fits fine, selecting components is important ahead of time. He pulled this whole thing out of a 3rd gen Camaro he had and just pretty much threw it in the car with the Granny's kit and called it a day. Utilizing the factory style mechanical fuel pump and all that sort of stuff. He doen't really have any issues after a couple small things were sorted out. has higher compression, bored over and all that junk. Whatever it makes more power than is necessary all the time.
I'll be mid-mounting the alternator on the passenger side to lower the height and have a better fitting hood and fancy stuff like that. Also cause I'd like to use a factory carbon fiber hood if possible.
I'll be spacing the rear of the hood up for added clearance for the air cleaner. Unless I go ahead and fuel inject it. Still contemplating that, as it will make the project take longer and cost far more.
Decisions, decisions......