Tried to Tune up the 460.....

Couldn't replace the fixed side of the points--kit came with an off-set arm, the one in my distributor is straight, so I polished it up good and reset the gap.

Fired her up and she still runs rough, misses some, both at idle and WOT. Lots of black smoke briefly at throttle up.

What's next, carb rebuild??

Compresion test. Any of the 6 cylinder gassers are hard on valves.

Assuming that's ok, pull the plug wires one at a time to see if you can find which cylinder is missing.

Did you replace the condensor when you replaced the points?

There's not something restricting the air intake to the carb, is there? That wouldn't cause a definite pronounced miss, but it'd be worth checking.

There's not a valve that's adjusted too tight or sticking is there?(compression test and finding out which cyl. is missing will help ya diagnose that if there is)

If compression is ok, it really, without actually being there, sounds like something along the lines of point dwell problems....get that fixed so you know it's right...(cam on distributor shaft isn't worn out is it? check point gap at each spot)or better yet, spring for an electronic ignition kit and eliminate your point worries forever.

I think first thing I'm gonna do is check each plug, make sure I'm getting spark, and then check compression.

I need to get to the bottom of this! The old girl runs cool as a cucumber and the oil pressure never drops under 40/45.

Seems to me that it would of course blow black if it isn't hitting on all cylinders and besides that, fuel doesn't usually cause a "misfire".

I'd be for checking that compression first and looking at the fuel last.

Allan