What is wrong with your current advance ?

I think I posted in another thread , a stock 750 advance is 10.5 or 11 on the arm , I have to check , I recently bought an NOS one for my 750 distributor. Also note the mechanical advance in a stock 750 is something like 31 degrees , I actually changed it on on the one I have to one that is less.

The 383- 2 bbl might actually be a better performing unit