Is this a real vintage Bianchi Strada?
Warning: this answer is based on rumours, speculation and hearsay.

Serial numbers:  I don't think the Good Lord Himself could make sense of Bianchi serial numbers, so don't put too much weight on that as anything is possible.

Lugs and frame design/welds looks somewhat odd for Bianchi, in fact without the decals I would have guessed Nishiki.  Thankfully, there is a fairly persistent rumour that Bianchi subcontracted cheap frames from Nishiki due to production problems while they were moving production from Japan to Taiwan in the mid 80s. If true, this could be one of those bikes.

If this is the case, it's a fun bit of bike history curiosa.  As others have noted, the suicide levers on an otherwise mid-range equipped bike says it's probably a US-specific model