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Very nice looking square body Burb!
These trucks technically fit into this year range, and are very similar in powertrain to the 88-91 pickups. Body and chassis wise, they're still square body trucks which are the previous generation. So you could also join the GM square body forum (gmsquarebody.com).
^ X2. Technically not a GMT400, but that thing is AWESOME.
Most of the info here isn't going to be relevant to you as your 'burb is a square body, but as far as I'm concerned you're welcome to stick around and post more pictures of that beauty.