The 550 was a middle/upper end of the road model, with Suntour Alpha 5000 components (those are pretty ordinary) I do not see the value mentioned above. Bridgestone catalogs are all online. Complete, that bike in nice used condition might bring $225 to $250 here in Hooterville. Add a premium for the NOS condition. You need two people that want it. It was near the higher end of the hundred series of bikes, but the Radacs were the top (three models).
Really depends on where you are located. Me, I would be putting it up on ebay, and hope some bidders got excited. I would not build it up, unless that is for personal use.
88 and 87 were both Suntour alpha 5000.