Initial timing
lemme add that if its a points distributor then it could be pre-smog, or it could be early CAP/CAS (smog) which had different specs nearly every year.
Download a 1966 Plymouth FSM.
The initial timing for a 225 should be set at slow idle, which should be 550 rpm with the headlights on.
If you can't get it to idle at 550, at least for the first iternation or two, get it as slow as you can to begin measuring timing vs. rpm.
With a dial back light or a hilly billy timing tape (marks) Measure timing up to at least 2000 rpm. Write it down and plot it. This is enough to see if its an emmissions or pre-emissions set up.
lemme add that if its a points distributor then it could be pre-smog, or it could be early CAP/CAS (smog) which had different specs nearly every year.
Download a 1966 Plymouth FSM.
The initial timing for a 225 should be set at slow idle, which should be 550 rpm with the headlights on.
If you can't get it to idle at 550, at least for the first iternation or two, get it as slow as you can to begin measuring timing vs. rpm.
With a dial back light or a hilly billy timing tape (marks) Measure timing up to at least 2000 rpm. Write it down and plot it. This is enough to see if its an emmissions or pre-emissions set up.