70 Challenger 512 stroker with Passon overdrive 4 speed. For quite some time the engine would have a death rattle ping when standing on it. Set timing back to 32 total, made no difference 10.25 compression Eddie heads. . Engine not running lean six pack.

Finally discovered(I'm slow sometimes) that with hand on gear shift no more ping. I've examined linkage, cannot see anything wrong. Likely less than 2k miles on it, pistol grip stock linkage. Perhaps nature of the beast?

Perhaps poly bushings would help? Any other ideas. Perhaps call Jamie at Passon?