i have a r block 48 degree std la cam tunnel ,and i have a cam 48 degree with the same journals all the way threw ,is it best to grind the cam down or bore the cam tunnel to size

1.37 60 ft [email]6.0@113[/email] [email]9.57@141[/email] 408 glide 3550lbs
new video http://www.youtube.com/watch?feature=player_embedded&v=Xvq3ZObywQE