Dieter, I remember we had discussed your situation in the past. THe original 331 w/ single carb was certainly not slow (I am sure it was thirsty). So, the problem you had was most likely due to a bad carburetor rather than a design improvement due to the dual carb. 1000 cfms is certainly extremely overkill for a small 331 (especially if you have the original cam). My guess is that a single carburetor would work better for your car regarding economy and low speed response, and given your stock cam, may have little to no effect on the upper end (ie, at 4500-5000 rpm, the valvetrain and head will be your main restriction rather than the carburetor). I understand that your system now works and looks good, so I am sure you will hesitate to change it now. I would probably do the same thing. But if Dougs single carb setup works, he might not get any benefit (other than under-hood looks) by doing the conversion, unless he also replaces the cam, and may be some exhaust work... D^2 Quoting "Dietz800@xxxxxxx" <Dietz800@xxxxxxx>: > Doug > > I converted my 55 2door 331 single 4 barrel setup into a Weiand intake > > manifold and 2 -4 barrel Edelbrock carbs. I kept the original camshaft > and > decided on 500 cfm's per carburetor. She was slow and thirsty before but > now > she is fast and thirsty.