My brother has an '88GT with GT40 Irons (ported, dont know how much), TFS Track Heat Intake, B303, 1.7 rockers, CAI, K&N, Crane HI-6, Long Tube Headers, 5-Speed. Have no idea on his HP.
I think his best so far is a 12.89@106 on slicks, but he's got more there, he wasn't launching that hard...