Did the Mach 1 run 12.5 with all the mods?if yes that's crazy because that's a low 11 or 10 sec car.I've seen a bone stock Mach 1 on slicks run 12.9 at Great Lakes dragway last year.Here is one with CAI, Longtubes, 4.10's and slicks, plus a tune
MACH 1 video
BTW Mach 1 has dohc 4v engine.