I'll stick by my two vac secondary 390's recommendation for a street engine. After all, that gives a healthy 780cfm potential which will serve a small V8 very well thank you! Just take your time and tune them properly. Any carb is a good carb, problems come when someone who doesn't know what they are doing tunes them improperly. Holleys, Carters, Edelbrocks can be dreams or nightmares, just depends on if you know what you are doing. Avoid the siren's song of bigger is better for carbs. Sure you can run two 1000cfm Dominators on the street but why? If for looks then by all means go ahead. I run a Holley 950cfm 3-bbl on my 354 for the look but I modified it so it runs more like a 650cfm @ part throttle (see inserts I made for the primary throttle bores in photo). Yes it is a racing carb but notice that Holley designed it w/ vacuum secondary. Wonder what they knew? However if you are after performance and economy (a well designed hot rod engine), then go with a properly sized vacuum secondary carb setup.