You shouldn't need a boost referenced carb with 5 psi. You can do it if you want, but it's not necessary. Don't bother with vacuum advance, you don't really need the extra 1 mpg it might give you. Nothing about this engine build will be sensible, nor economical. Which is a great thing The cam profile will affect driveability more than the blower will. The blower just moves more air through the engine. Set up the cam and drivetrain to work together, just like on any other engine.