Don't forget the other GM turbo/not a car, the GMC Typhoon SUV, all wheel drive too, with 330 hp (285 quoted but showed from a few dyno runs to be more than stock). Blocks are good for 400 hp for many miles, less as the power goes past that, some bad boys running 9's now, zero to sixty is just sick on many moderatly mod'd trucks, and was a best of 5.3 stock, but did not have nice hood louvers like Jeep.
Just some info.
Jeff M