Guys, thanks for all the oil input.  Here http://motorcycleinfo.calsci.com/API.html is a pretty good explanation of the oil grades.  Today I switched to Castrol Tection Extra C1-4 Plus (with ZDD) diesel engine oil for my new (1000 miles) 350 with flat tappet cam. 
Dennis McGillis
1965 Chevelle Malibu SS-350

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