Yeah, that is what I am trying to figure out. Which one to use for the best gas mileage in my 1979 C10? I pulled out the old integral 250 and I am putting in a freshly rebuilt 292, mild cam (.514 lift/260 duration) with .40 over 30cc dished pistons (bought the rebuilt short block from Leo Santucci) and a 61cc head that has been rebuilt with hardened seats and springs to match that cam. Clifford manifold and Langdon cast headers. I have a new in box 390 Holley but I think I am going to sell it. My main focus is just a daily driver. I am not looking for high horsepower. I just want a reliable, easy driveing truck and as good a mileage as I can get. I like taking long trips. The whole idea of a progressive carb seems right to me. I've used Holley's before and they run OK but the mileage is awful for regular use. And I can't afford EFI. Any suggestions would be appreciated.
