Not Ranked
It aint the dist springs, I'd bet money on it. That only controls how fast and possibly how much mechanical advance is coming in. Which is easy to check with a timing light anyway.
Point is: You DO have enough advance at 18 and even a little bit of mechanical advance would add more to that. There is, in my opinion, "enough" advance for the motor to run pretty darn good at 4,000 rpm and higher. Therefore, I must conclude, "timing" is NOT the issue here. Running lean maybe, a BAD distributor in general maybe, possible valve float (but that would be a major screw up on the builders part). Timing? Thats a red herring, ignore it and move on.
This assumes of course TDC really is TDC, and likely it really is, something else going on I tell ya...
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