If you haven't already may be worth checking for corrosion of calipers, front foot wells - I had a HUGE hole in front n/side well - front inner wings for holes, crank breather hose for split, crap in the fuel sedmenter, rusting of fuel line unions (where they meet lift pump), holes in sills if you have plastic covers on them. All of these are issues I've found with my disco 'project' and after doing a bit of research seem to be common problems - other than all the rust!!