Do you have an aftermarket tach? Or the stock one with whatever set up is needed to work with MSD?
I'm not certain the Sun timing light with tach would be so accurate, is it new or old? Some "trick" timing lights don't work well with MSD type ignitions. But it could very well be reading correctly.
Hopefully you'll be set with Rick's stuff.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
