One solution to getting more volume without dealing with the 2-carb headaches might be to modify a stock 1-BBL intake manifold to accept a single Rochester small-bore 2-barrel like the 265's and early 283's ran. I've considered doing that, but never got around to setting up a manifold in a milling machine and making the necessary carb base adapter. Just bolting on some sort of aftermarket adapter leaves the original 1-BBL flange in place and defeats the purpose of having more venturi volume available- - - -the stock manifold flange becomes the choke point.
Back in the 1950's Dad used a similar technique to outrun his competitors at the local dirt track- - - -a single big Zenith 2-BBL with removable venturis bored out for maximum volume, and a modified stock single-carb intake on a flathead Ford V-8. He was outperforming 3-carb engines and had none of the carb synchronizing headaches the other racers had to deal with. Everybody was running methanol, BTW, and our fuel mixture included a healthy dose of Hydrogen Peroxide as an oxidizer. The fuel was so corrosive they had to run the carb dry every time the engine was shut down, or it would eat the bottom out of the float chamber. The fuel tank was a stainless steel beer keg!
Jerry
