On the 85 GT I just got that sat for 2 years, the passenger side front brake caliper and the rear drivers side caliper are sticking a little, not locked down but dragging on the rotor. Could this maybe be the sliders tha need to be taken out and cleaned and re-lubed? Thanks

It might be that. Also, it could be that the brake hoses pinched on the inside, keeping fluid pressure in the piston.