On the last lap Mac catches Bell.  For a brief, very dramatic,  moment the cars were side-by-side, then Bell squirted down the corkscrew ahead. 

I thought Bell had second place secured (Walton was way ahead  in his yellow Ferrari 250LM), but Mac stayed close to the blue coupe on the downhill side of the course, then  pulled up even braking for Turn 11.   The two cars slid around the corner, then powered  up the last straight.  Mac's 7000cc's of big block Ford power were just enough to nose the red car past the blue car at the finish line.