So is this what I should be concentrating on then? How much more hp we looking at?
I'm sure it's already been said, but cracking 400hp NA is going to cost some change. If it's what you really want, then by all means, chase the dream. That's what I'm doing. It looks like the motor I wanted will be pushed to an indefinite timeframe, but I will be getting heads and cams at some point.
Starting from scratch, I'd estimate well over $10K for everything. Probably closer to $12-15K depending on how you shop and who does your work for you. If it's just numbers you want, a s/c/turbo will cover that, will be half the price and you can install it in your driveway.