Running on 7 cyl.

[RotaryRocketeer]

1976 one ton single cab with a 350. Vortec heads, RV cam, Accel HEI, Performer RPM, Edelbrock carb, unknown long tube headers.

Checking fluids after work today before the drive home, I noticed my #7 spark plug wire was touching its respective header so I moved it forward a bit. When I did this, the plug moved with it. Loose as all get out. So my buddy was hanging out talking with me and we decided to go to his house to tighten it (he lives way closer to work than I do.)

Got there and tightened it after a huge hassle. He doesn't have anything with headers, so the tool selection wasn't ideal for the job. Truck was running like a well balanced top beforehand, and now it feels like it's running on 7 cylinders and sounds like it too.

Made it home and figured that the #5 and #7 wires were too close to one another and arcing, causing #7 to fire 90 degrees early. Hopped in for a test drive and guess what. No change. Looking for a little input here. It woke up as a monster this morning and went to bed as a hot soft turd. Any help is greatly appreciated.