Re: power valve and jets
Actually, I think you are right about the plug heat range, with the R43's they foul, with R45's they don't. When it's just idling from box to the show it tends to build up, then a few runs down the 1320 and it's all 'clean' 
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Marlin
70 Yenko Nova-350/360, 4speed M21, 4.10 Posi (Daddy's Ride)
69 SS Nova-396/375hp, 4speed M20, 3.55 Posi (Benjamin's Ride)
67 RS Camaro-327/250hp, 2speed Glide, & 3.08 Open (Danny's Ride)
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