Unfortunately I can only identify part numbers, not casting numbers. I do know the casting number for the A-body should be 2863900.
Unless the pic is confusing me, the bend by the flange on the drivers side is not flat enough to be A-body.
Rob...have you been over to BigBlockDart.com? They'll know for sure. Look for "Jim Lusk". He's done several BB/A -bodies and would know what fits and what doesn't.