pot232,
The figures in my old note for the -320(old cowls, not new noise reduction cowls) was 9 degrees roll, in the landing attitude, with the main oleos compressed. The inboard engine tailpipes strike first.
Wings out of level (X-wind cockup) on takeoff or landing, O attitude, 11.5/12 degrees, the outboard pods fan cowl scrape first.
For a tail-strike, as 411A said. With the small elevators, a tail-strike needed very vigorous mishandling or an aft C.of G and a miss-set stab, but the aircraft was geometry limited.
It is in the original Boeing Intercontinental 320 manual. Ask Boeing for a copy of the page from the Training Manual.
Tailwise, the original 300 (none left flying - are you certain your mean 300, not 320, -300 had P&W JT-4, or RR Conway engines, as far as I know, only the KC-135 was ever re-engined with JT3D-3B or -7) was less of a problem, and on the -120/720 and the -138 very difficult, but not impossible, to drag the a-----.
Tootle pip!!
PS: Loved the B767, theoretically impossible to scrape a pod --- made up for it by being quite easy to scrape the tail.
PS2: Many JT-3 straightpipe -120/720/138 were re-engined, with the original engine converted to JT3-MC6.