Hi Roy,
Your Primary chain is going to be a 426 size chain. They will all either state 426 size or cross reference back to 426. It says you need 67 pitches, order a chain with 70 or so because you just never know with old stuff what might have been changed over the years from stock.
Pitches means links, do a quick google and you will understand in 2 minutes what it would take me 20 to type.
Your drive chain will be 530 size chain and you need 98 pitches, again get it a little longer.
I would not bother trying to fit anything but regular chain. They make o-ring, x-ring, all kinds of coatings, I would just concentrate on getting chain you know will fit. Regular chain.
Lee