GM HEI

check your firing order. 1-8-4-3-6-5-7-2

nate

while I havnt checked the firing order the engine runs extremely smooth above 2k rpm. Keep in mind this is a problem that just all of a sudden started after i was already drving down the road for 2+ hours. I will check the firing order this morning, but unless wires switch themselves around on the fly, I dont think this will be the answer.

thanks, Zack

Why assume automatically that it's an ignition problem? You said you had two badly fouled plugs from oil. That sounds more like a cylinder problem. Check those plugs again if you remember which cylinders. Otherwise pull all plugs and inspect.

I'd check for a vacuum leak next.

I made a sort of foolish post some months ago about the HEI system (not my first error, and probably wont be my last either). The earlier GM HEI systems had the coil built into the distributor cap, as I remember it. Later versions were, I am told, different.

If yours is of this earlier type, you need to be aware that internal arcing around the coil and even inside the cap itself is something you need to keep in mind.