I have a 1974 454cid, stock save for HEI with Accel top.
I just had the carb calibrated and the idle screw won't adjust. I can turn it in or out and idle does change a bit. Carb is a 625?cfm Quadra-Jet.(stock with rebuild 10 yrs ago)
It won't get up and go unless I feather some gas in prior to full throttle.
I think my fuel pump is weak.

I am being told to step up to an electric pump but I have original wiring in the car and I am not sure I should be adding any more electrics in. What is the pros cons to mech fuel pump from Carter or Edelbrock(10psi) vs. an electric fuel pump?

Not that it matters but the car is a 1966 Chevelle Malibu