I too am running a small port head on a 270 with dual Zeniths on a big port intake with adapter rings. 9:1 compression J&E pistons and dual cast headers and 264H grind cam from the place in Tacoma (can't remember the name, but not impressed with the cam) . . . I am also running SBC valves as big as would fit with blending of the bowls and light porting.
The engine runs great on the street with an A833 tranny in front of a 3.73 12 bolt posi in a 50 GMC pickup.
