Eddie carb problems

my first thoughts are that the mechanical fuel pump is junk. just because its new doesnt make it good. i wanted a solid 5-6 of fuel pressure so i went a bought an electric pump and regulator and set it at 5.5 for my holley 600. edelbrock 625-750 generally need a solid 5.5-6. when i had my "new" mechanical pump running through my pressure gauge, i could watch it jump around anywhere from 2.5 to 6 and my carburetor was starving for fuel. edelbrocks seem to be real sensitive to heat and they like to percolate fuel. a spacer or heat shield would help keep the fuel cooler. my $0.02