Holly made a 500 2 bbl cfm & that is fine. There were two size dual jets carbs GM put on cars I believe they were a 350 cfm & a 500 CFM? Maybe someone else here knows for sure? The old circle track guys used the larger ones I am pretty sure they were 500CFM ,because after a while they were hard to find so they changed the rule book stating they could run a 500 CFM 2 bbl Holly. Besides you can always disconnect the secondaries & only run on the primary's. Later, if you hop it up a bit you can hook back up the secondaries. 500 CFM is not too big far a stocker, it will work OK.Just run it on the primaries. Holly's seem, for the most part need some attention @ some time or another. The Eddlebrocks ,you just hop in & drive, no worry's.
