Putting together a 403 and i need a carb 650 or 700, dub pumper vac sec man choke holley

 

"double pumper vacum secondary"? The terms are contradictory. Did you mean either one?

 

Oh, i think vaccume secondary is what i want, i just want an efficient, reliable street carb thats easy to deal with, i have never bought one before, im 15 so thanks for any corrections/ additional info im trying to learn everything i can and find good sources for parts