First things first cubic inches cubic inches cubic inches. Vacuum is the easy part any good custom ground cam can get you to put what ever vacuum you need.
Derrick
Wanting to know which is better for having to pull vacum bleed off lifters or mechanical roller lifters? Running windsor have to pull 17 inches at 1000 rpm . To run in the street class. Need to run around 550-600 horse power . Have to run factory heads & dual plane intake .