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...