You,d be better off going auto with 800hp,unless you have mucho dunaro,s $$.You can race with a 4 speed,but be prepared to have breakage each outing as 19Dart66 has mentioned.Good luck...Been there/Done that.
I realize I'd probably be better off going auto but I'm pretty commited to going manual. Everybody can do a fast car with an auto but a 10 second car with a stick. That would be something. (Of course I mean no disrespect to those who have built an auto car. A 10 Second car with any style trans is pretty impressive.)