Best is to take it to a frame shop and find out for sure that the frame/body is not twisted. Correct it as needed. If it is not twisted, replace the springs and hanger bushings. You could go the cheap way and put spring spacers from Lakewood (traction bar company etc) in where they would do the job. As far as the engine I would remove the plugs and squirt a little marvel mystery oil in each cylinder. Then make or purchase an oil pump driver and spin the pump until oil is present at all rocker arms. I am assuming you have a V8. Then spin it over until the mm oil is mostly squirted out and replace the plugs. drain the old gas and put in new gas and crank her up. good luck.