do what the former owner did.......
if it has the hardened seats in the heads you should be fine wth the unleaded premiun..
if it has a flat tappet cam then make sure you run an
oil with zddp in it or ad it to an
oil that does not have the zddp or if its a full roller you dont need to worry about the zddp stuff.....i sent you a private message.....did you get it ???