[eagle]

To check for consistent strong spark, lift all of the spark plug straps so there is about an eighth inch gap then in a darkened area run the starter while watching the spark on each strap. It should be strong and steady. Its an easy to do test that really tells you a lot when troubleshooting an issue. The biggest challenge is usually separating a problem into fuel vs spark. In your case you also need to verify timing but that's not hard, I'd pull the valve cover and watch the valves in conjunction with TDC.