I set my timing at 43 but if you whack the throttle good you can see it backs up to 39 ish.

You need lots of advance on that cam and lots of rpms I ran a 272/282 .700 lift 110 LSA in my 452 installed at 100 and it loved 7600 to 7800 shifts.

Same combo now with 255/263 .700 lift 108 LSA installed at 103 runs same times with 7200 shifts.