Would an 82 Chevy Caprice service/shop manual be useful for my 83 or too many differences?
Better to wait until I find an 83 manual?

(of course, on the other hand, who needs a manual when we have this forum!)

Would an 82 Chevy Caprice service/shop manual be useful for my 83 or too many differences?
Better to wait until I find an 83 manual?

(of course, on the other hand, who needs a manual when we have this forum!)

There's negligible difference between the two years, even the computers are the same. You should be good to go.

Any particular area you need an assist with?