If it's a 1966 engine in a 1966 boat it's an early model configuration for which I know very little personally. For the oil fill, look for a hinged lid below the distributor. As for the dipstick, someone with early model knowledge will be along soon I'm sure.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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