one option is to do the 91-92 style side GFX, leave your front bumper and get an aftermarket front lip spoiler that fits that. however youd still need a rear bumper to go with any oem style z28/iroc gfx, the 1/4 peices need to match the rear bumper year(ie. 82-84, 85-90, 91-92)
this is the xenon kit. JUST AN EXAMPLE OF AN AFTERMARKET FRONT