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What spark plug and heat range are you running now and how much total timing are you running ? I think your location is at or close to sea level, correct?



As is, I'm running Champion RC9YCs. I had the 12s like Edelbrock suggests but the engine had consistent run-on until I switched to the colder plug. I am just barely above seal level.
I am told that the MP distributor has an aggressive timing curve. I'm at 17 initial, 31 total in really early, like under 2500. It knocks at WOT on 91. A mix of 110 and 91 cures the knock, but I want to make it street friendly. Some of the responses I'm getting elsewhere suggest to skip the head gasket swap and concentrate on the timing curve and a cam swap. I just wish that I knew someone that had a near identical engine combo so I could get a better idea of which cam would work.
4000 70 Charger, stock body, 295 tire, 3.91 gear with a Gear Vendors OD.
440, .030 over 4.35 bore.
Ross Flat Top pistons, 6 cc valve reliefs, .017 in the hole at TDC.
Edelbrock heads, 84 ccs UNported, .039 head gasket.
.056 quench distance.
292/509 cam installed straight up, 1.6 rockers, 3/8" pushrods.
850 Demon VS, 85/92 jets, 3.5 PV
2" TTI headers, 2 1/2" exhaust