Here's a better visual utilizing a Straight Edge to show all of the Scalloped/Undercut/Thin Areas in the 400 Castings in Relation to the 455 #485428 (1972) Casting.
I'm going to make multiple posts to show a variety of angles for each Casting.
Here's the Passenger's Side Front View.

1972 455 #485428

1967 400 #9786133

1971 400 #481988
More to Come,
Larry S.
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