Of course I'd have to chime in on this, a turbo or supercharger are dead giveaways because of noise, as are massive cams so there's only one real internal power adder left. Compression. Mill those 243's or get 706's of a 5.3 get it up around 11:1, a cam with a fairly wide LSA (Like 114) a nice quiet exhaust with a cutout added and just to make sure you don't bring a knife to a gunfight a nice shot of the good stuff.