I have a couple of sets of 7-fin offset-hole Hoover valve covers; one set of low-script (used through 1958 S/N 3600 or so), and one set of high-script (used from '58 S/N 3600 until about 1959 S/N 6000 or so, when the heads changed to parallel holes for the covers).
The early '56 9-fin covers without the notches in the inboard flange are rare as hen's teeth. The second-design '56 2x4 intake with larger runners required the notches.
