Engine misfire or loading up when opening the 4 barrel.

Genes 340 said
How would you check the fuel pump? It came from O’Reilly. I did change the dual line feed to one of the ones that has like a JIC type fitting that comes out of the carburetor to a braided line with jic fittings as well. It has a gauge in line but it doesn’t read. I figured there’s just not enough pressure to show I mean, they only usually push about 7 pounds
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That O’Reily stock replacement pump may not be enough for your warmed up 340. It should make “some” pressure on a gauge though. 3-6 psi I’d think. You can test it by free flowing it into a bucket for 20 seconds or so and comparing that to published data for that specific pump.