If the timing had been right I'd be all over it. Only thing that'd hold me back would be if the tonneau hold down lug holes had been welded up. All I'd do is drill out the filler and put the lugs back on, fill in the holes where the flat tonneau clips would be and simply paint some black paint on the top edge of the tray to cover the repair (gets covered by an original style tonneau anyway). And replace the M21 with a trimatic. Awesome car.