Yep, it was a Camcraft cam.
284 deg duration
Intake opens at 30 BTDC
Intake closes at 74 ABDC
Exhaust opens at 74 BBDC
Exhaust closes at 30 ATDC
60 deg overlap

In '66 would this be a solid cam? So it's 495/505 lift and 284* advertised duration?
How much cfm was the holley 4160??
What gear set in the the rear? Was it 4.86?