S41 on the pad for 62...there may be exceptions.

286 last 3 digits of the head #'s

No heat cross over & no horse shoe shape air gap in the head in that area. Used to be one of the quickest ways of telling before the repo's

4 bolt vale cover in 62-63

Rocker shaft hold down stands are aluminum for 62-63. 64's heads (518) had cast in stands like a 440.

Intake #'s not in my head.