It depends on how much money you have. If you have alot, I would go with this:
AFR 180cc heads($1300 for the street porting)
Performer RPM airgap intake,
XR270HR cam (218,
[email protected], .495 .502 lift)
holley 700-750 carb
If you have limited funds this:
Vortec heads ( $630 with the spring upgrade from scoggin dickey)
Performer RPM intake
XE268H cam (224, 230 @.050, .477 .480 lift)
holley 700-750 carb
1 5/8" headers on either combo
Both motors would make over 500ft.lbs. of tq
the AFR combo would probably have 50-75 more hp though.
Both of these combos will start making power pretty much at an idle, and make power to around 5000-5500 RPM. If that is to low for you, you would just want to go with a slightly larger cam and heads.
Good luck
Adam