What I am looking for is to why the power just isn't there, it runs smooth and sounds great. The carb has size 73 jets and i have went though out and documented everything about the carb itself. maybe it is within the timing, I am not for sure what the advanced springs are, will check it out this weekend if it would stop raining ! It should light up those tires at a take off. I have factory 3.73 gears in the rear end. The old motor (used to ) burn em up back in the day..... I do some towing (boat) and want to have it run good to ( haul butt) .