My dad blew up his Stealth, so now we have to rebuild it. He wants to go full on performance with it, so I was wondering if anybody here had rebuilt a 6G72 from a Stealth/3000GT and had any tips to share for making it a semi-performance engine. I already know it's going to cost a lot, it's highly likely we need full head work done (valves, machining) and the entire bottom end is likely to need replaced.