Holley guru's- need advice

That carb was recommended to me by Brian at IMM engines. I'm getting ready to have him set me up with a set of RHS heads and a nice solid lifter cam. He said to use a 750dp/RPM airgap w/ a 1" spacer. I trust what he says. Just trying to put this carb back to a stock setting so it'll be tuneable once the changes are made.