600 vs 750 Holley

.............Hey Don.........u should see a pretty good performance improvement.........wont be much difference in mileage if u keep ur foot out of it.........kim........

More power yes,mileage not to worried.Its all rebuilt now,I have 70 jets up front stock plate in the rear, 4.5 power valve,#31 nozzle,light spring for the secondary's, all blue gaskets.Maybe try it out just before I put the Dart away.Thanks again.