360 issues-need help!

Does it only break up or miss when you are getting on it or at light loads as well? If at heavy throttle only, possibly fuel related, but likely ignition. If it breaks up at all throttle settings, almost certainly ignition. Remember, 90% of "fuel related" problems are ignition related.

I would start by doing a thorough tune up including new plugs, cap and rotor (buy a good ones like Blue Streak or Accel), PCV valve, and fuel filter. Hook up your vacuum advance to the timed vacuum port on the carb; on an AFB, AVS or Edelbrock this is the port to the right on the front of the carb. If you look carefully this port will be slightly higher up on the carb than the port on the left. Note where yout timing is at BEFORE you touch anything, and in fact I wouldnt monkey with it yet (assuming its set to about 10-12 degrees initial advance at idle). After each new part drive the car, better? If not, try new plug wires next especially if the existing ones say "supression core". (Accel Super Stock wires are basically OEM grade stuff at best, especially the non-spiral wound ones) No need to spend the megabucks on a set of Taylors just yet, a $25 set of parts house specials will work fine for troubleshooting. Also make sure the coil is bolted down securely and the primary wires are on tight, correct polarity, and in good condition.

Next, and only after all of the above would I start screwing with the carb. Clean, rebuild etc... Pay close attention to the float level (where it is set now and where it should be). If you have a fuel related problem, that would be the first place I would look. Keep an eye out for hackery (modifications) made by the previous owner, as thats enough cam to cause some people to start making carb mods (for better or worse). Also, are you sure its a 750? AFB or AVS? Whats the carb number (located on lower right corner)? A 750 is fine for your combo, but most factory AFB's were a lot closer to 600.

In any event locate and "repair" the problem before you "tune" or you will just chase your tail. Avoid "shotgun maintenance" and make one change at a time otherwise you will never know what was wrong. A higher stall speed will help your combo; less pull against brakes at lights, better launch, etc...