HO 4750 decal and ARROW questions

[nw-modeling-list at nwhs.org]

    I am looking for some information about decals to do the NW  HC 
71  4750 covered hoppers.
I only have a couple of the Herald King  H-51 decal sets for these, 
and will need to use something else for the rest of the cars I want 
to do.    I see that the society has the Wilson McClung  decals set 
HO 20-1 and I am wondering if that set has the correct data for the 
HC 71 cars ?

   Also I seem to remember an issue of the Arrow  that had info about 
the 4750's maybe even the 4740's . I've been searching through my 
back issues from the '90's but I can't find it, can someone tell me 
if there was an issue with that, and what the date was?
and other than the photo in the color guide, are there other photo's 
of these N&W covered hoppers?      Any help will be appreciated,  Ken Rees