O/D Oil Recommendation - non-detergent SAE30?

[Jay Snable <jsnable@mac.com>]

I'd like to follow John Esposito's advice and fill my J-Type O/D with 
non-detergent SAE30 oil. Does anyone have any brand/source recommendations? I 
have only found either detergent oil (Castrol HD) or oild that doesn't specify 
(Pennzoil). A search of the archives showed that finding this stuff has been a 
problem in the past.

Will stop at another place on the way home...

Jay
'73 TR6 in SF Bay Area