Questions about valve stem seals

OP, I'd just go on RockAuto or to NAPA and get the stock Felpro seals. Your engine has plenty of age on it and just getting anything in there will help any oil down the guides! (FWIW..... personally, I use the rope trick.. just makes me feel better that there is no physical way for the valve to drop.)

BTW, getting the keepers to break free from the retainers can be vexing. One way is to put the open end of a socket on the retainer, and pop it with a hammer to break the keepers free. (I assume you know that you need a spring compressor too.)