I have a customers with 500+ inch engines running both TF270 and Indy EZ heads. Those engines make 850 to 870 hp with high compression and drag race roller cams. For a street engine with 10:1 compression and a street roller cam profile I think you could easily make 700 hp and probably close to 700 torque. The cam will be a key choice. You'll also need a good intake and a 1050 Dominator. I think the TF race intake with the MW ports and the 4500 flange is what I'd buy but the Edelbrock Super Victor is also a good choice. I've never run a Dominator on the street but I'd think it could be made to work on 540 inches. You could also go with a 4500 flange Holley Sniper. The big Sniper will work great on the street and it gives you the ability to control the timing with the computer as well as interface to a Digital Dash. All depends on which way you wan to go.