1964 Valiant "Get Runnin & Drivin"

RustyRatRod said

I don't know of a high flow mechanical fuel pump for a slant 6, do you? I "guess" I could get a big block hv pump and swap the arms out since other then that, they'll interchange. I don't think it's running out of fuel though. It would lay down on hard acceleration draining the float bowls and it's not doing that. At all.

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I went the big block fuel pump route. I used a replacement hemi one. 33gph at 7psi. Good for 400hp. It introduced other problems. Primarily bending the tabs on the floats for a edelbrock 500 avs. My symptoms was the engine ran fine with the stock pump. When I was at the track, it would start to stumble at the top of second gear and never recover. So I kept jetting up until I couldn't go any further. The plugs always looked fine. Then I did the research to figure out why.

If you think your relatively middle engine needs to be jetted 6 jet sizes larger then what came with the carb. More power to you.