well, means you did not pull the cam, remove the chain, and you've advanced/retard the timing, I would say either fuel delivery or something is wrong with you Mallory distributor. OR..... what ECU are you using? Could that be playing games?
It’s hard to believe that every one of those was working fine and now one isn’t. I’ll see what I can figure out. I have a truck I can swap some parts from to try. I’ll have to look again, but I believe it has the silver ignition box.
