Surely being too cold is NOT the issue. Unlike other brands the lower the number the hotter the plug with NGK. #5s
are as hot as they get. My KRE headed 455 uses #7s
. 11s fouled in 30 minutes. 9s were gettng there. 8s were a tad too brown. 7s hit the mark perfectly. Just trial and error got me to that point. The plugs are not too cold. You lost spark or detonation finally cooked rings or a piston or two. Hopefully its a $25 cap and $50 wires. Fingers crossed for you my friend post your findings after a leak down and tune up!
Well I just got off the phone with Jay the second owner in Tucson who had the engine rebuilt in 2012.
He had stock style pistons installed, Shield Power. He told me he had the engine built to stock specs except for the cam. The engine should be 10.5 to 1 or less.
Mike at JMS supposedly replaced all the bearings and had the crank polished
The Pertronics distributor must be locked out since the vacuum module is capped off.
The spark plug wires are Accel Hi temp Super stock radio suppression, running through the factory tubes.
The carb that JMS installed is a Holley vac secondary 80783- list#.
Jay in Tucson put probably less than 1,000 miles on the engine when I purchased it and maybe 500 miles were put on it at JMS before I had it delivered to my house by AAA. I have put 150 miles on it since I brought it home.
All of my diagnostic shit is at the Colorado River house in Arizona with the Hallett Mini Cruiser, 4 hours away from me.
I'm taking the GOAT in tomorrow to a shop I trust so we will see what they discover.
I will post the results.
Thank you everyone for your advice and concerns.