Just so everyone has the info incase anyone else was wondering the same things i was. Tom emailed me and was able to resolve 95% of my questions.
Stock block and crank can hold up to about 600hp
Stock axles and Getrag are fine for 450whp(after that i didnt ask so i dont know)
The head is %100 fine stock for up to 450whp. He advised me to replace gaskets and use ARP Studs. Most likely will go with titanium vavles and retainers as a precaution while i have the head open anyhow.