ISO a mechanic that can (i guess) "Rebuild" a Holley Carburator, it is a "United Carb 9-913" or it cross refferences to a "Holley 4487" its on my 85' F600 Ford Truck, I already took it out of the truck, it ran good, but last time i tried to use it it leaks a lot of gas. please give me a price range on what you would charge !, thanks.