Worth the trouble?
If it was mine I would pull it apart and put in a set of h116cp pistons. I would keep the valves maybe mill the head a little. I think I would swap in a more modern grind camshaft like
http://www.summitracing.com/parts/HRS-CL710581-10/
or a slightly milder cam
http://www.summitracing.com/parts/HRS-710461-10/
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