Valve seals

[68LAlonghorn]

Hi All,

I've been reading this amazing forum since I purchased my '68 C20 Longhorn about four months ago.This is the first time I've done any work on a truck, so definitely a newbie, but mechanically inclined, so been able to do a lot already thanks to the amazing information I've been able to find here, so thanks so much to all of you!
My first post is to ask about valve seals. I've read a lot of good things about the Fel-Pro SS 72527 for the intake and the SS 72526 for the exhaust, but when I look into purchasing them, it shows as not compatible with my '68 327 and shows the SS 10058 as the correct seals. My question is, can I use the positive seals or being an older engine I should use the older umbrella type seals for both intake and exhaust?

Thanks in advance for any help.