I've run 275's on 7" rims for years and years on several different cars with absolutely no ill affects at all. Only reason I do it is because of the surplus of 7" rims I have around here. Honestly I like the looks on an 8" rim too but I'm not going out of my way to buy a set unless the need arises.
Have had this setup on my 70 Formula for nearly 20 years, as well as my 72 chevelle. The Formula looks just fine, however I do prefer an 8" wheel on the chevelle and have run the chevelle with 8" for almost 25 years, I just currently happen to have 7" on it at the moment.
If needed, I can pull one or the other outside for pics when I get a chance.
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