Need to know if it will fit?????

Looking at a Pontiac Tri Power Manifold & thermostat housing. It has an intake casting number 53G194 GM1 Date code H69. Does anyone know if it will fit a stock 389 Pontiac original from 1959....

clemmarrero.....that third numeral is a "6," not a "G." 536194 is the standard Tri-Power intake manifold for 1960. It is the only other year intake that will bolt right up to 1959 heads. 1960 was the first year that didn't use reverse flow cooling, so I'm not sure that the manifold has a fitting for the heater hose. Look for an approximately 3/4" pipe or threaded hole, just to the passenger side of the front carburetor flange. H69 is August 6th, 1959, about the right time period for starting to cast 1960 parts......John