[Argess]

I have the video form Pony Carbs and the part on ignition timing is totally wrong. He says to adjsut the dist for the best idle with vacuum disconnected. I have a mech-only dist, and best idle is up around 38 Deg, but imagine if I stepped on the gas with that much advance? Major detonation.

I helped a friend with his newly re-built boat engine (Chev 350....mercrusier) It was off by 2 teeth. Ran perfectly, but would not rev past about 3000 rpm.

I suspect your timing, now that you mention how you did it. However, if you have "black smoke", you may be getting too much accelerator pump shot. Back to the white cam most likely.