The builder of my new engine recommended Shell 15-40 Rotella. I had never even heard of it until I asked him for recommendations.
Should be able to crank for first time this Sunday if all goes well. Daughter AND grand-daughter have been in town for the past week, so I've been a bit tied up.
'68 428 HO M3 Monster, 4-on-the-floor! Need I say more?