Attached is the reference I was thinking about.
I've also gone to AC Delco's website to compare the Gold and Ultra Gold filters.
https://www.acdelco.com/parts/filter...art-type%2Foil
12699847 is listed for LT4s, too, so that's what I've used. Hot idle is right around 30-psi and gets up to about 70-psi at WOT/6500.