tatao--The pipe running from the intercooler to the carb is hooked up by two ways. One-You can connect the pipe to the top of the carb, but you have to use a specially built carb. Two-You have to use a carb encloser that completely surrounds the carb.
I do not know the answer to the mpg question. From what I've read, mpg is slightly decreased, but it's not by much. The power gain is well worth a couple mpg in my book. I know you can use four barrel carbs. I would think you would be able to use a two barrel carb also, since you're dealing with a single carb. Multiple one barrels would be difficult. I don't see why anyone would want to run multiple one barrels when they are running a turbo. Unless it would be for the quick throttle response that's common with multiple 1bbls.
As far as books go, Leo Santucci's book recommends "Maximum Boost" by Corkey Bell, "Turbochargers" by Hugh MacInnes, and "Super Power" by Larry Schreib.
For supercharging he lists "Super Power" by Larry Schreib (same as above), and "Street Supercharging" by Pat Ganahl. I hope this helps. John.
