Time for a New carb

ace you probley know this but i'll give my 2 cents worth what your plugs look like black white,grey i'd go from there on cfm i think you'd get better m.p.g with the 750 eldebrock then buy the trick kit to tune it for your motor,but when a holleys right they got more umph to em then again if yours runs good and just leaks i think you can replace the shaft to fix leak