It has a pump in front housing - not replaceable.
RockAuto (as does Autozone) has oil pump repair kits.
Might call your local parts house to see if they can get
you the kit.
http://www.rockauto.com/catalog/x,ca...,pgname,Engine
I'll PM ya with a scan from the oil pump repair procedure page
in a 1970 Motor's Manual ... let me know if you didnt' get the PM
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