All the iron headed motors I've tuned on the dyno and at the track like right at 34 to 36 max on both race gas and pump swill
BTW,, all of them would slow down with 33 and 37 total, which works well when your trying to slow the car down for a index. Retarding it is way safer than advancing them also
Aluminum headed motor may like more timing also, no two motors are identical, just like timing lights and timing marks, correct
I like to retard the timing a little at a time until the car starts to slow down and then go the other way one degree at a time until it stops going faster and then split the difference to be safe