Problems: Electical or Fuel?

[Fox Body]

Alright, I've almost exhausted all my options. For the last week and a half, the stang's been sick. First it started off as the battery wasn't getting charged. After much troubleshooting and a new alternator
(a bit hasty on my part, but hey, it only costed $36), I found it to be the wires going to the back of the alt were rotting and broke off. I've fixed those since.

But now that the charging problem seems to be totally taken care of, there is something else weird that is going on: At cruise speeds, there is a very slight stumbling. It's really apparent when I really get down on it (WOT). At the end of each rev for 1rst and 2nd gear at near WOT, it stumbles. It's the kind of thing that makes you sure it's either a clogged air filter or fuel line, but I've run it with filter removed and also changed fuel filter and same thing happens (but seems to be a little less apparent).

I've checked all the plugs and all look fine also, they're under 10,000 miles old-- should not be plugs. I have a relatively new rotor and cap.

The things next on my list to check are plug wires, and coil. Anyone think this could be a coil issue or perhaps distributer. An external visual inspection on the plug wires says they're A okay, but could be some internal issues, don't know (they've been on there since motor was built ~ 2 years ago, but shouldn't have to change them so soon. Also, voltage regulator is relatively new (whole charging system is fine). I run usually run 89 octane, but put in 93 every once in a while. I was thinking about gasoline, but I'm pretty sure it's not an octane issue and the quality of gas I'm pretty sure is just fine also (Amoco or Chevron).

Last thing on my list is to go over the carb to see if that is the culprit.

This should've been a simple fix, but I'm not finding what the problem is. I've gone through many other different things and still no solution. So I am coming here (after over a week of troubleshooting).

I need some advice guys. Any suggestion? The car will drive, but she's still a little sick and won't win any races until this thing is cleared up.

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351W-powered 1979 Ford Mustang notchback
Stock 5.8L under custom made 4" cowl, C4 w/ shift kit
Holley 750 cfm, Edelbrock Performer RPM intake
1 5/8" MAC shorty headers, Al driveshaft
2.5" Off road H-pipe, 2-chamber Flowmasters
Front: 225/60/15, Rear: 255/60/15 Eagle GT II
Weld wheels (15x6;15x8), 8.8" Rear w/ 3.55s
14 x 4” K&N air filter. Only a couple of weeks b4 Project FOX begins!!!

"Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body