where are you getting the 48 hp gain from the Rudy Pulley?
If I've calculated correctly.....
370cfm cylinder displacement/requirement ( minus fuel vol) at 6000rpm
stock 14.5psi = 690cfm intake required at atm.
eg: rudy 62mm pulley at 20.2psi = 825cfm intake at atm. = +20% (70hp?)
You got some losses factored in? SC eff etc.