Ed, I tried the sandwich type on my first engine and was happy with it. I think it was Earls as I was getting pretty happy with their plumbing. However, when I put in the modified boss, it was reconfigured for center
oil and I did not put in the cooler afterwards.
The Earls worked at 190 ( as best I remember ).
Hope you and the family are keeping warm and should I miss it, happy holidays.
Tru