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Re: backfire through carb, need help
I think I would measure the voltage to the distributor.
You may or may not know HEI needs a solid 12 volts to run best. If you used the original distributor power wire on the truck it won't do. It is a resistor wire dropping the volts down to 8 or 9 or so for the old points type ignition.
If supply voltage is good I'd switch back to the HEI distributor and give it a try. Just because the MSD unit was new doesn't mean it can't be bad.
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Boog
69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver
primer is finer
91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said.
I stand for the flag and kneel at the cross
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