Originally Posted by thatsmrmastercraft
Also agree that if one change is to be made it should be a new prop. I would also look at the ignition system and upgrade to electronic (if it isn't already) and confirm that you are getting all the advance you are supposed to. I would also go through the carb as well.
I wouldn't worry to much with total timing advance. I would just ensure that its working as designed. On my original point distributor with EI it was 29° @ 3000 rpm and I "thought" it needed more timing so I bought the high dollar adjustable unilite marine distributor ($350) and set it at 36° and did some tuning and I actually picked up 100 rpm by bringing the timing back to 29°. Oh well at least I have a good spare...