To me that combo would have a decent amount of thump without modification. But you will love the 302s, I bolted stock ones on my engine with a bigger cam and it felt really good, balanced power from idle up. I think I was only pulling about 8-10 vacuum at idle.... needless to say my engine is apart getting a little bit freshened up. :)
Also how much are you taking off the heads or are you just doing the block deck? I want to clean my heads up a bit and gain a bit of compression but I can't spend a fortune right now.