Crappy running continues...with a twist now

whats on the engine, carb? ignition?

Blown4.6 said:

Okay, I've been going around and around with the stumble on light to moderate acelleration and also cruise forever.

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i know how this junk goes

Have you checked the fuel filter for a clog? An inline pressure guage would be ideal, but filters are cheap enough if you haven't replaced it in a while. If you suspect the choke is not working properly, this is another obvious suspect that would cause the symptoms you describe. Hard to tell based on what you described if it's a fuel or spark problem. Keep us posted on any other nuggets that night help solve the puzzle.

How old is the carb? Try disconnecting the wire to the choke, make sure the choke blade is in the upright position and see if the problem persists when engine is warm.

Sounds like it's carb related. The accellerator pump may be the problem here. Maybe the carb needs a rebuild.

Stolen from Blown 4.6's specs said:

Ignition: Pertronix Distributor w/flamethrower coil

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Never heard of it happening to this particular brand; but inside that Pertronix Ignitor module there's either an SCR or an FET (electronic acronyms for "little components filled with smoke") that might very well be on its way out the door. After you've gone all over fuel delivery and vacuum hoses; if nothing else turns up, look at the module - maybe swap it with somebody else's, if you've got a really good friend that's willing to take a chance.
Those particular ("transistors" is a good generic technical term) as a group have be known to once-in-a-while develop a "hole" in their semiconductor layers that will "heal itself" now and then; and once they "heal", you're back in business. This breaking down doesn't happen that often, but it can happen. If this is what you're experiencing right now, you can rest assured that you will finally pinpoint the problem when it will die completely and forever - on the freeway, in the rain, on your way to a job interview or in the bottom of Salt River Canyon in Southern Arizona in mid-August (don't ask how I know - both instances).
It just doesn't happen all that often (given the sheer numbers of Pertronix/MSD/Duraspark/GM HEI boxes that are out there); but if nothing else turns up.... But as I said, I know it can happen. MSD on my (long gone) '72 F100, re-badged Duraspark on my then-girlfriend's AMC Gremlin (apt name for the car).