Exactly what
@AZD says. Long exposure times, high contrast grade; results are hit & miss. If the print must be a darkroom print, then it can work this way. But for a technically better print, scan the color negative and then output in whatever way desired.
I too have developed AND printed an old C41 film in b/w chemicals. The negatives were a bit thin but I was able to print them on RC MG paper at grade 5. The exposures weren't too long at all when printed as 7" x 5" prints.
The film was found after an old camera was bought in a charity shop. The purchaser of the camera then approached the photography club to which I was then a member, and as I was the only person who still used a darkroom, I volunteered to give it all a go, with no promises. Yes, the prints lacked a bit of contrast and the grain was a bit more obvious, but the receivers of the prints were more than happy with the results.
This story was then reported by a local newspaper, of which was later picked up by another paper. The biggest surprise of all, was that the family in the pictures were traced and the now grown up children were very grateful for the prints. So all I can add, is to give it a go.
And if you get it in your head to search out some Panalure, don't bother. None of it will be any good.
Koraks' advice is likely the best and easiest way to go.
As for Don's advice, I would say it's down to the individual. Lots of older papers are being bought up by lith printers, like myself, and we find the majority of it to be fine to print lith on, although older papers have a tendency to have fog, so it's a chance one takes if it's going to be used for its original purpose. But, there is a LOT of panalure paper on eBay, at quite low prices. It's the p+p that hurts the most. But, if I did it again, I'd definitely look at purchasing a pack with fingers crossed.
And yes, as said, scanning and then printing the negatives on an inkjet is probably the easiest route, but I for one would definitely try to make a print or two in the darkroom first, with or without some panalure paper.
Terry S
UK