if its power you want, buy the z06, add twins, save money. 7L > 6.2L. The 427 has iron sleeves, so i cannot see them not being boost friendly. The internals are BEEF on that LS9 though. I want to know why chevy chose titanium for the rods. If I am not mistaken titanium (though stronger than aluminum) fatigues faster than aluminum, and power gains NA were found in much higher rpms. If its the same block as the 427, with the deck plate and lower displacement, it better rev to like 8500rpm. Expect $20k+ for a crate IF its available.