High 14's? No turbo? Oof. I guess you could entirely gut the interior, shed the A/C and P/S, lose as much weight as possible (your own!) and wait for a tailwind.
A.K.A. "Ain't gonna happen."
I keep asking this, and nobody answers, so we'll give you a try: What kind of budget are you working on? Cash dictates direction.
For me, with a 3400lb. wagon, I'd set my sights on keeping speed attained, and that goes beyond the track.
So, how much money?