I was eyeballing a 69 Camaro a couple days ago at a cruise-in and looked at the engine location. The engine looked dead nuts in the middle and straight. I guess Pontiac engines are a lot wider than even big block Chevy's. So you probably don't want to try to put a Pontiac engine in a first gen Camaro.
A lot of people seem to freak about the crooked engine when they first get their car, including myself. Maybe Geoff should put a statement on the main page of this site that says "Don't worry. The engine is supposed to be crooked!"