Indeed newer aluminum wheels such as those found on 4x4 Toyota's have the same bolt pattern as our 60-66 6 lug trucks.
Problem is the center hole size is different (bigger) and these style wheels have a lot of backspacing.
That doesn't mean they won't bolt up, it's just that depending on what size tires you use you may have some rubbing issues.
Are you familiar with the 67-72 chevy truck website? They have a lot of posts in regard to different wheel types on our 60-66 trucks. Check this out:
http://67-72chevytrucks.com/vboard/search.php?searchid=1973342&pp=25Hope this helps!