we did get the vac unit from the old carb, and we have ABOUT 34 total right now, I don't feel comfortable giving it any more than that using pump gas. It could probably benefit from more in depth tuning of the advance curve and limit the mechanical advance, therefore allowing more initial advance though. I know your right thinking there is more power to be found by more initial timing though. I spent a while just trying to get the choke issues figured out today...hopefully they are good and Dean can just drive it now!