cam question

rumblefish

the thermoquad was recently replaced due to it being a little tired (floats sticking etc) but retained. it was replaced with a holley 650 w/vacum secondaries. i was under the impresssion that the regular performer manifold would give me a little more bottom end over the rpm and that the rpm was only benificial in the upper rpm range. i want to keep the bottom end as much as possible. that is why i was leaning towards the regular performer. correct me on this if my thinking is wrong. thats why im picking everyones brain before purchase. i was also considering the air gap but was concerned about hood clearance issues. any comment on that idea??