Joe, Yes you did mention checking the timing mark (and scribing across the entire balancer to quickly tell if it's correct) but if you set the timing without knowing that it's incorrect you can run severe advance without realizing it. We found that out when we were running a SBC at about 65 degrees advance because the timing mark had moved and we didn't realize it when we set it. Luckily we found it before holing a piston when we checked the timing again and it had moved dramatically.
YMMV...
Butch Kummer
Former SCCA Director of Club Racing (July 2012 - Sept 2014)
2006, 2007, 2010 SARRC GTA Champion
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