Lubbock you really cannot depend engine changes in that close of a time period.. The damn heads were purchased by the carload and they were installed till they were out of them. Also the head bolts changed from some to other heads and the valve covers were different on each change.. They sort of built what they had at the time back then. And they never made a metal valve cover that will fit the gasket that fits the plastic cover.. It is the one with one side that is almost straight from one end to the other..
These are my findings anyway.. others may have found different patterns.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />