I have an 383 with about 11.1 compression and had an e-85 carb built by mark sullens and i have heard that you should pick up about 2 tens by switching. But i actually lost mph and am running the same time. And also i have notinced that it is calling of at about 5500 rpm. I am my engine is a 383 with flat toip pistons, afr 195cc heads with 65cc combustion chamber. Victor jr. intake with 1in carb spacer single plain, Hydralic roller with a 294 cam timing set at 38 degrees and primary jets are 84 and secondarys 82 i think. So am wondering what kind of jets you guys are running in primary and secondary also total timing. My distributer is locked. On premium my car went 11.70 at 117 and e-85 went 11.69 at 114. Just wanting to get some other ideas of were to start. Thanks