Depending on the actual cylinder pressure and the camshaft used, it may run fine on 87. My sons 10.5-1 330 runs on 87. But much nicer on 93 with a more aggressive timing curve with more initial advance at 20 instead of 16.
My ‘00 5.9 Magnum likes 89 best. Same as above. Retard the initial time some and a lazy timing curve and it’ll run on 87.
In both cases, best power is t being made but I like the cheaper fuel costs over the premium price tag and I’ll live a few hp down.
In both cases, a larger cam would be a real boost in performance. But consume more fuel. Never mind the more aggressive accompanying timing curve.
I’m confused about what you said on cam duration. 205@050 until 1800? The 220@050?
What’s the secret there!?!?!