I don't think you would, I was reffering to constructing the ductwork into the carb....a carb hat. At 15 psi I don't think you would want to draw-thru, too much temp increase, but at 7-8 psi it can be done, I have seen several setups like that.
The regulator ("E" impco) I am using is rated for 360 hp, so if you need more than that you are goning to have to double them up.