engine cutting out 292

[69chevy lwb]

I have a 292 I6 in my 69 c10 and ithas ran flawlessly until my last car show trip which ended up being 500 miles or so on the way home I noticed a small cut out in the engine when going up an incline and it has seemed to get worse since. I thought it was a fuel issue maybe the diaphragm going bad in the fuel pump so I replaced that, the fuel filter , and the carb filter with no success. So I looked into electrical problems thinking maybe the coil was dying but seemed okay other than the old hei was worn out so I replaced it with a new one no luck so I'm not sure where to look now there's no carbon build up like I'm arcing through a wire but I have limited it down to 2200 rpm and up and gets worse from there the cut out feels like a total loss of power at times or it will rhythmically run fine for 3 sec then give 3 cut outs then repeat any ideas? Sorry for the novel
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