Lower unit lube change 1980 Chrysler 7.5

[Slimbob]

Any ideas on how to change the lower unit lubricant on a :

7.5 hp Chrysler model # 72HOC S/N 1818 Think it is 1980 model year.

The fill and vent screws are right next to each other. Not high and low like my Gamefisher.

Thanks,
Slimbob