Too much timing advance can cause it to flatten out at 3/4 throttle. I'd try to retard it 2 degrees and see if it helps. Sounds like you are at the 'seat of the pants' level of dialing it in. Getting real close to on the money. Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
