340 headers?

Now thats a thought, where would you get the spitfires? I did have the 3.9's in the car at one time but took them out because of the high rpm's on the highway. Used them in the desktop dyno and dragstrip calculations at the time. The car did run in the 12's when I had slicks, and the nitrous on full at the starting line but the dyno numbers were way off. There are better simulator programs out there now.