If it's a 4779 with no numbers after that it's the first version of that carb - they have since made a -1,-2,-3,-4. That don't make your carb bad though. Specs: Mod. 4150, 750CFM, pri jets = 75, sec jets = 76, power valve = 8.5 ( BTW, @ 3-5" yours is open ( dumping fuel )all the time - not good, and a contributing factor to your other problems. ), pri discharge nozzle = .025, sec discharge nozzle = .032, square carb with all 4 holes @ 1 11/16" dia. Thatil be $5!