No of course bigger is not better. From my experiance the opposite is usually the better option. That bieng said I probably just made a mistake, but the price was right. So my car is an 86 cutlass with a ten and a half to one 383 sbc, full roller, aluminum heads, 3.55 gears, with a munci for speed. I origanly ran a 650 double pumper on this set up and the car really responded well to having mechanical secondaries, but it was a swap meet special I should of left at the swap meet. I'm pretty competiant at these carbs, and this one would not clean up at idel. So I finaly switched it for a 750 vacuum secondaries. Which runs very well, but it lost some of its punch. So the power to wieght of the car coupled with the manual trans does kinda call for a mechanical secondary. So an 800 main body came available to me for cheap so I bought it. I have all the other parts to build it right. So I guess my question is do I have a chance at making this work or is going to be way to big. I'm gonna try either way but I'd still like to hear your opinions.