so I put the carter on the 361 and went back to mechanical pump and that brought mileage to 10 plus now. I have not done any real long runs yet for a good test tho.
When i put the carter on it was used and thought i could just bolt it on and see. it ran way better than the holley with more power but accelerator pump was bad. I bought a rebuild kit and took top of and the piston for metering rods was frozen!! it should not have hardly run at all. now with everything working right it has WAY more power. I really dont need 4.88s now. 3rd gear starts with scale weight near 11 K with gravel on board. ;/)