how far can one turn down a crank?

#1, the extra side clearance won't hurt a thing and #2, if it bothers you that much Eagle, Manley, Molnar and probably others make a 7.100/.990 rod that is Mopar width on the big end. 440 Source has a 7.100/2.20/.990 rod for their cranks but I don't know what the big end width end is.