I'd suggest a 400 cubic inch (should be able to find one cheap since the muscle car group isn't looking for them) with a long arm cross ram intake (don't hesitate to weld it up yourself if you can't find an original) so that you've got a 4 barrel carb hanging out over each front fender!! Leave the hood off so everyone can get a good look. (one less part you need to find)

Now THAT would be eye popping!!!

Tav