In an effort to give correct information, here are the end play, (thrust) clearance specs. from assorted Pontiac Chassis service manuals I had easily available here.
1961, 1962, 1965, 1966: .0035"- .0085". 1967, 1970, 1973, 1975: .003"- .009". Personally, I won't let anything leave here tighter than .005, looser than .011. Over .012" = trouble. (note: I had a small mistake on the specs. in post #4.)
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