Hi everyone... working on a '70 383 roadrunner with Automatic. I've got what's left of the build sheet trying to figure out what codes belong on the valve covers and 8-3/4 axle housing and center section. On the build sheets under axle, D is the number 56. Also, next to P/shaft is another axle section coded 052. Where and what/which get's stamped on the axle housing and the center section? Also, I can't find anyting anywhere that would indicate what belongs on the front of the valve covers. Thanks everyone!