I picked up a carter afb 600 cfm carb...when I got it it had an addapter plate on it wich I do not need....my 350 sbc has 4 studs in the top in outer 4 of 8 holes for carb....my question is to the inner 4 holes that are slightly smaller than the holes the studs are in do these need to be used or pluged or should I take the studs out of the intake and get bolts for em??