I've already been that route. My setup was similar to bmalone's above. I have a 390 and was running dual 500 Webers, .572 lift w/296° duration on the cam, 9.5 CR and 3.50:1 gearing w/tremec 3550. I agree with the above posts that the duals are 'streetable' but I decided to swap out to a single (Holley 770) as it is much easier to keep up with (maintenance/tuning).
Of course, I gave up a noticable bit of HP in the process, but in reality, the car still screams with more power than I'll probably ever use. Also with the single, no more 'loading up' at idle (read -
'eye burning').
Gene