1970 351C M Code valve stem seals?

Cougar Community Classic Cougar Maintenance Restoration and Repair
1

So, I’m going to do valve seals on my car, and Rock Auto as well as AutoZone list two different (FelPro) part numbers for intake (SS13364-1) and exhaust (SS72562), but I did a google search and saw people say the part numbers are the same for intake and exhaust.
To complicate things, If I do a search by engine on the FelPro site, it returns nothing for 1970 351C.
Can anybody clarify?

Thanks!

Rick

2

These are original type Fel Pro valve stem seals for 351C: