Took a stab at rebuilding the Q-Jet the PO installed. The cleanup and reassembly was easy, tuning turned out kinda bad. On first start up the motor was running real rich. So I popped the top off, reset the float, and buttoned it back up. Second start up was much better, but still rich. about 30 seconds after it was idling, it started knocking, LOUD! Turned it off, and check to make sure all the carb screws were in place; CHECK,, all good. Nothing went down the carb. Started it back up, still loud. Pulled off each plug wire one at a time to try and isolate the sound. No luck. One did change it some, but not much. Got pissed. Let it sit for an hour, started it back up, reved the piss out it, it got a bit better. Hmmm. Let it sit over night, and this AM it is still knocking but not as loud. Any ideas? MY guess is the carb dumped so much gas down the cylinders it washed off the oil and it messed up a rod or six.