Define timing by the book&amp;gt; Did you flow time it or line up the marks? Instead of fooling with flow timing, is to just advance the timing one set of holes and see where you are on Horse Power. You may even need to go two holes, But if all else fails you may need to flow time it. I had the degrees what moving it one hole figgured out once, but have forgoten that through the years. Also are you looking for horsepower or torque? 50 years ago they put out a bulletin on timing for torque instead of horsepower. I need to look it up, forgot what is in the bulletin. How good is the compression? How good is the dynometer? I also had a few that to get the preformanace I had to retard the timing one hole. Find out what all they did to the head. Ask them how good the tappet in the pump was. Fuel filters are new? How does it start cold? hot?