Hi Andrew,
I have no experience with EPM's, but I'd be very leery about putting any 35 year old magnesium wheels with an unknown history back in service without a complete strip down with inspection, testing, and re-coating by a certified company such as PTI Industries. And even then probably only on nice smooth race tracks. I think good safe wheels for our Pantahs are the most difficult and most expensive items to get right. Maybe Magni could offer some good advice?
Bill
http://www.magni.it/epm_6_razze.htmhttp://ptiindustries.com/services/