62, 235 always ran great. Then,……… one day, she would start and idle fine. As RPMs increased, she falls on her face. No backfire or anything like that. Acting like She’s drowning. Replaced points 2x, with two different point part numbers. Same effect. Vacuum advance does work. Condenser and 6v coil also have been replaced. Timing is at 6-BTDC and point gap is .018. Distributor is a newer aftermarket replacement that operated perfectly before this issue. It’s a Wai- DST1609. Correct for the engine. Vacuum at venture is 20” or so. At the wiper port, 50”. I can drive it as long as RPMs stay low, and no real load. I’m leaning towards distributor advance springs. Suggestions?
Thanks,
Jim
