[Old-Ford-Iron]

So I am sending a cam to be ground. I discovered mine are dissimilar. Both came out of 59's. One says Ford. Both say 21A. Both have same timing gears when dismantled.

The one marked ford/21A has two slots. One letting oil in/out/under into oil pump and a slot letting oil in/out/under into the valve valley.

The one marked 21A only has the one letting oil flow back and forth to oil pump.

Anyone have any preference?

thoughts on oil pressure?

which one would you grind and install in your rebuild.