Engine hesitation and Stall on acceleration

Ok, so after spending all day on the car I still have an issue but have ruled out alot of possibilities.

Its is not the carb, I took it off completely dismantled it and its good I did as there was a small amount of debris, also found some slop flaws in casting of the secondary rods, made sure everything was in spec with the floats, reassembled and still had the problem.

Next I ran an external pump from a mason jar full of gas to the inlet line to the carb, bypassing the tank, pump, and bottom filter. The external pump kept the car running for a little under 10 min and I turned it off. Which means not a carb or ignition related issue.

So it must be something from the fuel pump back. So I changed the fuel pump with a precision pump from Oreilly, $20 stock mechanical pump. Still has the problem.

So I figure ok maybe metal fuel line, pickup or crap in the tank. Dropped the tank, pickup and strainer were fine. The tank needed a good cleaning as there was alot of loose crud. Used the compressor to blow out the metal line, some rust color crud came out eventually all the crud came out. Changed the rubber fuel line at the pick up as well, installed tank and Still a problem!

Ive tried 3 different fuel filters, the original was a clear wix filter. the 2nd was the clear filter the edelbrock carb came with, and the 3rd is a metal wix filter. Same issue.

So last test I did which I should of done earlier, was the external pump from the metal fuel at the engine bay that goes to the tank, and ran it to the carb. So now Im pulling fuel directly from the tank to the carb. Car runs! and for 10 min again.

So its not the tank, fuel line from tank, sender, carb, ignition, only thing is the fuel pump.

Odd that a new Carter pump I only had on there for less than 500 miles would just crap out, and then I changed to another brand new one today and same issue. 2 pumps as its not impossible is just odd.

The only other thing besides the pump is the cam lobe that drives the pump. But if it was loose im sure it would be making some noise, Im going to remove the pump and check its position with a bore scope but id don't think this is the issue as I remember torquing it to spec.

Again car has been running great for about 4 weeks, and this just started to happen last night. quite odd.