[Joe's Garage]

Guideplates bolted on either under the screw-in studs on 'performance' (GTO/FB/GP) engines or with two separate bolts on each one for 'low performance engines with pressed studs.

Drippers were the stamped sheet metal style with the three mounting towers and attached via the (3) studded head bolts.

Ram Air III used standard-style 5/16" pushrods and standard guideplates.

Ram Air IV had the 11/32" guideplates along with the more elaborate adjuster/dripper/stabilizer assemblies that attached directly to the top of the rocker studs and was used to adjust the valves. Kind of a miniature stud girdle.

Pretty sure that the drippers that were welded to the valve covers started in 1973.

Since very few of us bought our Pontiacs brand new, it's fairly normal to find that that things have been swapped around in the past fifty-plus years.