I am starting to accumulate parts for an engine rebuild. Basically a stock GM 350 with headers, Weiand intake #7546 and a Edelbrock 600CFM carb. I will be installing MSD distributor, MSD 6al, roller rockers and cam. Right now I am trying to understand intake terminology. I can "see" the difference between dual and single plane intakes but don't know which would be better. I currently have the existing intake, Weiand 7546, or also have a Weiand 8004, or a Edelbrock 2975. Which should I use, or should I sell them all and buy something else? The car is mainly just a strip car right now but would like to be able to pass emissions so i can drive it around town. Thanks in advance for any advice.