Have you confirmed that the damper ring hasnt slipped and the timing isnt where you actually think it is? Confirm the zero mark on the damper with TDC on cylinder #1?

This sounds more like a timing/ignition/firing issue.

Good battery voltage?

RIP Monte Smith

Your work is a reflection of yourself, autograph it with quality.

WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.