If you had HepC in the past, even if you got treated and you're healthy now, it will always show in your blood tests. Usually when a Hep A,B,C test turns out positive, they retest it again to see if the infection is present now or if it occurred in the past. If it occurred in the past, then you shouldn't have any problems...
For sure that's your case, as there are no vaccines against HepC.