Not sure if they're still available but years ago I got a set of Monroe load leveler shocks. They were coil over and bumped the rear up just enough. Only issue is the axle bumper has to be modified or removed.
Some here have had springs re-arched, I never have. You could always cut a coil off the front to bring it down an inch but just how bouncy and saggy is the 40 year old suspension?

Or go redneck, shackles and air shocks. Make sure you paint the differental spray bomb Red.