This could end up being an interesting discussion...
Chrisb808.... I'm wondering...why did you choose 350hp as a target?
More specifically, what are your actual goals for the car? What is the purpose for the build? Street car fun? Dual-duty daily driver and weekend racer? 1/4 mile competition?
Do you plan to run in formal events at all? Autocrosses? Road-course events? Or just a fast, fun car for the street?
Are you budgeting suspension and braking mods into the grand total? If not, you should consider it...you something to slow the car down and keep it on the road while the 350hp are working.
It always raises a little flag when I see someone set their goal as a "power output" rather than an actual usage. If you're true goal is only to produce and experience 350hp, then go nitrous.
If you are worried about nitrous because of danger to your motor, then you've now added a "goal": reliability. Now you consider how much compromise in reliability you are willing to accept... and so on.
Let us know what your actual usage goals are. Then this will get fun.
Cheers,
-Smoky