The cast-aluminum rocker covers once used on Boss 302s, and the repros from all the vendors will clear roller rockers AND most stud girdles if you remove the tin baffles inside. My baffles have all been gone 20 years and 70,000 miles with no problems.
Yes- run a PCV or internal crankcase pressures will force oil past both main bearing seals and a number of gaskets, making a mess.
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