Go check out and CALL the suppliers for what you want. They will set you up with what you exactly need. Dont just buy a part number off the internet, it will mess up your build I can guarantee it!
Check out SRP/JE here:
http://www.srp.com/
Check out Diamond here:
http://www.diamondracing.net/
Pump gas 600hp is totally possible and street worthy!
Ive got a 700+HP dual quad tunnel ram 496 that is turn key ready everytime I take it out and it purrs like a kitten at idle with a 700+ lift solid flat tap cam. 10.5:1 CR with Iron 990 heads (have been worked) and runs on 93 octane all day long. But when I put some 110 in it.... it really wakes it up!
https://youtu.be/wi1kLIyw5_U