carb recommendations

looking for a new carb for my project, mild 360, edelbrock heads, performer rpm, intake and heads, 10:5 to 1 comp. roller cam, headers, 3000stall, and 4:10 rear gears, if needed I can get cam specs, street car, occasional street legal night at the strip, I think I want a mech secondary, thinking along the holley ultra series or a mighty demon, but I have no idea as to size, 650? 750? don't want something to big that makes it lazy on the street. what do you guys think, ??? size? mech sec or vac sec?