Correct Water Pump for Early 273 w/ AC

Thread revival for those who search....

I wound up with that same damn Gates pump with the 3rd outlet on top and I can't use it on my original factory A/C car either. Not to mention, where the bypass hose fitting would thread in is a full 1-inch diameter; not the 3/4" it is supposed to be so my hose nipple doesn't fit.

I read in some other forums about that possibly being a marine motor pump. Hell if I know.