I'll bet that dollar that Andy was using that all your problems will be gone once you change over to HEI. I had similar things going on a few years ago. HEI was already installed but I was getting serious intake backfire under load, going up hills etc. Got it home and pulled the dist. cap. The center point was shattered. It must have been a real light show in there when the truck was running.
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1970 GMC 1500 Custom
Original 350/TH350
Victoria, BC, Canada
You can wish in one hand and crap in the other.
See which one gets filled first.
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