That would be good for the Twincam and the old Pinto.
I remember when Mobile 1 brought out this acclaimed unnatural oil they called Synthetic and was very very expensive. So I bought a bottle of what was then 5w 40. Popped that in the Twincam and the result was instant and upon starting the engine a brown pool swirled around my feet as if it was lifting its leg like a dog showing contempt on my shoe. Its been mineral 20W 50 ever since!