Jeffs on 17"s lowered on a pro-kit. if anything ditch the Gt wheels, do the GTS conversion and put a 60 series tire on the 14"s, it was a decent ride in the 88 GT rob had.
man i had it pretty much bottomed out in the rear for way too long, like when i hit anybump it would bottom out and never touched the wheels at all. fronts might if i take a really hard corner then hit a bump but barely ever