I just did this. Vortecs, roller rocker and edlbeock airgap (sorta over kill imo) and tried to run the 670 truck avenger but had no luck. After calling Holley they talked me into a 770 street Avenger. It really does run a lot better. Dont know about gas tho. I do have to burn the good stuff. It'll smoke the tires on a 4x4 with 35's.
