That is a beautiful truck........right up to the point of ruining it with that sun visor.
That is a 89~91 R/V series front end.
It only came on 89~91 Blazers, Suburbans, and the R/V series 2500, and 3500 series trucks.
Since your truck is an '83 all you will need to change is the core support, grille, headlights, marker lights, and the wiring harness.
Also, when swapping you will need to use the little body panel between the bumper, and grille from the 89~91. Your '83 won't work.
I recommend a salvage yard search to get all of the parts. Almost none of these parts are available new from GM anymore. I bought the last grille in the GM parts chain just before the grille part number was cancelled. The headlight bezels, and marker lights used to be available, but may have been discontinued. The core support, headlight buckets, and wiring harness hasn't been available for a long time.
There used to be a few lists on the forums that list OE GM part numbers, if you had those you could atleast search NOS supplys.
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