why don't you put a fuel pressure gauge in line right before it goes into the carb and see what pressure you have at the carb instead of directly off the fuel pump?
what fuel pump are you using ?
I have a Weber DCOE carb on my SA and I use a Carter fuel pump and a Holley FPR set @ 3.5 psi.with stock fuel lines and an after market in line fuel filter from Napa. The carter pump gives you good flow @ the 3.5 psi. I have had this setup on my SA for 8-10 years and it runs very well.
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1979 SA F Prepared solo/ Track day car 12a w/Weber carb,RB header and exhaust,
Ground Control coilovers, camber/caster plates
GforceEng.panhard rod w/ tri-link,Panasports wheels w/Hoosier slicks.
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