I just bought a 1998 z28 and the guy that had it before me swapped the engine for a 6.0L LQ4 and put LS1 heads on it. He did some other things to it as well such as headers and exhaust and rebuilt the transmission and gears and what not. He said the car has about 400 hp. does this sound right, and when I'm ready to put some money into this car, do I get performance parts for the LQ4 truck or what? If that makes any sense.