"To benefit all, the reason it I had such a high bsfc at the upper end is because of the fact that I was pulling 2 inches of vacuum.
What did that do? Simple, When you have vacuum like that it pulls fuel from the power valve circuit. I couldn't make a jet change because it wasn't rich across the whole power curve, just when it started pulling vacuum, as the rpm increased. To make a jet change there it would have gone lean until it started pulling vacuum, consequently pulling fuel from the power valve circuit." Really, thats funny because when I run a small carb on one of my big blocks, the BSFCs dont take take off at 4800 RPM, although they do pull vacuum. Infact the carb used on my 519 HP engine that pulls clean past 4800 RPM was a 770 avenger. "LOL" I thought you were done