All the OEM Mopar V8 up to or maybe even a little later than 1985 had rope seals, they are not included in over haul gasket sets since around 1992 or so. They where replaced with a rubber like seal back then and the original paper type side seals went away around 10 yrs ago also
On your deal make sure you know exactly where the oil is leaking from before starting to fix it, don't be surprised if it has multiple leaks like from both of the side seals or one side seal and the oil pan gasket around one oil pan bolt hole or even a rear oil galley plug leaking or the cam rear cam plug leaking
I've had all of them leak in different motors in the past, not so much anymore with better seals and using a good adhesive sealant to completely seal up the sides of the rear main seal holder to the blocks
Keeps in the loop on your progress, you can fix this