Setting Dwell

I thought I was right but it just seemed wrong that his dwell would be less than spec. As the rubbing block wears the point gap should close, increasing dwell. So why is his dwell less than spec? Somebody could have put the points in with the wrong gap (very possible) or I guess something funky could be going on with metal transfer between the points surfaces. Gee, this stuff is fun! And I remember when I ran dual points & solid lifters & fenderwell headers & an open hood scoop on my daily driver. Ahhh, the good old days!