I tend to agree with Blownstang. Horsepower is pretty easy to make with a centrifugal supercharger. I went with a new ProCharger but used kits are abundant.
ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370.
USAF 1969-1973,1980-1996: Vietnam veteran. Aircraft maintenance. R & D, ICBM Operations.
Also own: 1997 Harley FXDWG, 1998 F-150, and 2002 Corvette LS1