I have recently swapped my original 383 RR distributor for a new MP distributor. My old distributor was set at 14 base and 38 total. I wanted and adjustable mechanical so I could give the motor more base. After installing the new MP I set the base at 20 and found my total at 37 all in at 3000rpm. I then set the base at 22 and now my total is at 41. The car runs good with now pinging on 94 octane. I cannot understand how MP states to have total at no more than 38. I am starting to think my timing light is bad, or my timing tdc is out. I am also looking for total all in by 2500rpm. I need some help before I go on a wild goose chase. It is a new rebuilt to factory specs with a mild cam. Thanks