water pump on 65 C20 with 230 I-6

[backtowork]

truck runs hot(so says the gauge) ..so while I'm in there, will be replacing the thermostat, flushing radiator and replacing the water pump..bought a replacement pump , but when i got back home, the pump didn't have the bypass hose neck..checked around and the pump with a neck is for a 292..will this fit?..after doing a search on this site, I couldn't find a definite answer, but am now confused as to problems with pulleys aligning?..hoping someone can shine a light on this..