how to mate '66 st gear w 80's 318 ps pump?

Is there a tailor made line(s) I can buy? the pump return line male hose barb nipple is much smaller than the male hose barb nipple on the '66 gear and the '66 gear needs a diff AN? fitting for the later PS hose to connect for the pressure hose (possibly AN 4 instead of AN 6). The '66 gear has a screw in fitting. Help me! I'm lost on this one