Let's start in the middle: 225, 2-bbl, 0.030" clean-up bore, 0.100" shaved of the ported head, stock size valves, Comp Cams 252M, stock 2.76 rear, and OD 4-speed. I played around with screen under the carb and got a best of 29 MPG. I then bought a (now defunct) product called the Power Plate. It was a 1" aluminum spacer with coolant jackets running through it (had to tap into the heater hoses for that). Each throttle bore had an 8* tapered cone with 20-pitch screw threads. The cones protruded about 1/2" - 3/4" into the intake plenum. With the Power Plate, it was like I pulled the /6 & dropped in a 360 2-bbl! The power was simply amazing! Oh, and I was able to squeeze a 44.7 MPG 55 MPH run out of it. It would deliver high 30's normal driving.
