Some good suggestions here so far but you need to answer a few questions:
1) stock block? If thats your plan, your only going to want to make 500hp anyway to keep it safe and reliable.
2) how much street time do you plan vs. how much sacrifice of street manners?
3) do you want to boost/NOS or do you want to keep it NA?
You can make 400rwhp NA at 10:1-11:1 or make 375rwhp range at 9:1-9.5:1 and have fun until you add low boost to get to 500rwhp.
I've had 450+rwhp NA and 460rwhp boosted and the blower car will be more streetable.
BTW, I've also had good success with Ed Curtis FTI.
-J