Chevy 250 inline 6 + Powerglide - (Dublin Ga in Macon, GA

I have a 1968 chevy 250CI inline 6 cylinder enigne and matching powerglide for sale, I have had the engine running last summer ive put a new water pump, and plug wires on it cleaned and rebuilt the carb, Cleaned and painted the intake and exhaust manifolds, and some other odds and ends, there is a vacuum leak at the base gasket on the carb, the eng