Milling the angle is an idea I've not heard of. its a give and take as if you gain clearance for the steering box, you lose on the dipstick. My 34, yes, different frame etc, fentons clear the box by an 1/8", but crash into the dipstick tube.
The tube and stick need some drastic bends that the fat Ford dipstick would not like going around corners. My remedy for that was to make a new tube from brake line, and use a modern wimpy dipstick with the Ford handle brased on top to fool all you guys.
Put 5 quarts of oil in and punch mark the new full level.