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Found it in the manual! Thanks RX330inFlorida, 76 ft.-lbs. for both 300 and 330. I just didn't look hard enough.
FWIW, I used the online electronic PDF edition found in the Owner's section of the Lexus web site. Made it easier to search. Took me several tries as the manual is broken into several parts. Somewhat silly in this age of high-speed Internet access.