Will not crank over 6600

DEFINITELY change the valve springs 1st. Just had the same issue on 7 race old springs. Now i change every 3 races its cheap insurance.
 
There are so many things that could keep that engine from turning the rpm you are after that it would be wise to have it looked at. Carb, head, springs, timing,
 
The only way you would have a coil problem would be your clearance and even then I don’t see that the issue. One other thing I forgot to mention in my list from earlier is the cc volume.
 
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