Appreciate your input. Here are some filters I stumbled on when looking at my options. All made in USA were my findings
-Baldwin/Hastings (seems some confusion on these)
We dynoed a few filters a few years ago Wix Racing,Fram HP and a Moroso for our BBC Super stock car. The moroso had the least pressure drop by 5 pounds(hot oil) and 27 Micron rating and this is what we ran forever.
Just passing it on.
The ac delco pf52 or pf52e seems to work even with alcohol based fuels.
We aim for coverage and I prefer the thicker heavier oils even though the thinner stuff should yield a few more ponies,we prefer the protection of the heavier weight as it's being subjected to m1.
Although if the car is on pure m1 we use different oil and filter for the most protection.
The ac stuff is made in Mexico i believe and it works from their plugs to filters from what I've seen even on alcohol based fuels up to e85.
Used alot of different stuff in the past and havent seen a difference so I just grab the ac stuff for most buicks.
I use some fram stuff too.
My stuff has alot of oil pressure.