Rebuilding distributor
Factory timing specs for '68 Plymouth if initial set at spec. Dodge was sometimes a little different but similar.
Initial could be increased or decreased a couple degrees depending on fuel, altitude etc.
With the automatic it should be no problem using 10* initial using premium. Even if the advance is near the max of the specs, timing will only be 32* at 3000, and 35* at 4000 rpm. That's in the ballpark of what that engine will like. It's easy enough to adjust when the secondary spring engages if it needs a little timing above 1500.
I know some Ford performance engines had very different curve. Different engines have different combustion efficiencies (and flame development) and also the difference in piston dwelling at the top etc etc.
Factory timing specs for '68 Plymouth if initial set at spec. Dodge was sometimes a little different but similar.
Initial could be increased or decreased a couple degrees depending on fuel, altitude etc.
With the automatic it should be no problem using 10* initial using premium. Even if the advance is near the max of the specs, timing will only be 32* at 3000, and 35* at 4000 rpm. That's in the ballpark of what that engine will like. It's easy enough to adjust when the secondary spring engages if it needs a little timing above 1500.
I know some Ford performance engines had very different curve. Different engines have different combustion efficiencies (and flame development) and also the difference in piston dwelling at the top etc etc.