Eric,
I was just cleaning up my floorpan the other week - here is a picture of the seat brackets from my 84 for reference that might be helpful if you haven't taken the seats out yet. I'd guess you could probably do as suggested above and do some fab work to lower them or bolt the seats directly to the floor - haven't done it myself - but thought this picture might be helpful with showing you how much could potentially be gained.
The only problem as I see it, is that lowering the driver's seat you'll have to re-located the ECU / Motronic box... as the seat will probably hit it if you lower the mounting brackets.
good luck.
earlier pic with motronic mounted
