TXDart said

Hey,
I was just throwing out ideas for ya...Maybe it is that fuel pump.
Sorry to hear of your electrical issues my 72 fried the instrument cluster before I bought it.I replaced the cluster and bypass that amp gauge.
On that swamp cooler ,I got one in my shop that I fiberglass the bottom and the inside 2 years ago and had an A/C guy make me a drip pan for cheap,just in case because it is inside my shop on pallet...Has not leaked a drop.Just a thought.

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GT340 said

Just tossing out an idea. Sounds like you've replaced/checked a lot of items. Spark plug wires with a high resistance open will cause missing at higher RPMs. A while back I put in new 8mm SPWires (well know supposedly top of the line wires) and developed a miss at higher RPMs. I took them back within hours of buying them and the parts dealer told me these wires are the best and didn't want to give me new ones. I bought some Taylor's and put them in and the miss was gone, he then gave me my money back for the other wires.

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