Lots of wrong info on this thread. First of all, the 1A2 might have been sold as a "Police Wagon", but it is NOT a "Pursuit Rated" car. It does NOT have the Police Sedan's Pursuit Suspension, it does NOT have the Heavy Duty Brakes. The 1A2 designation means "Public Service vehicle", it's a Heavy Duty, not a Go-Fast Package.
Engines available in the Caprice in 91-93 were the L03 170hp 305 V-8 (5.0), and the L05 180hp 350 V-8 (5.7), which had 195hp (91) or 205hp 8)(92-93) in Police/Special Service trim.
In 92 and 93 only, and only available on Taxi Package Sedans (9C6), the Caprice could also be ordered with a 4.3-Liter, 140hp V6 designated LB4. Yes, V6, and yes, you can quote me on that.
Engines available in the Caprice 94-96 were the L99 200hp 265 V-8 (4.3) and the LT1 260 hp 350 V-8 (5.7).
No 1A2s were available in 1996, but there seems to have at least one been built anyway, as were a few L99-powered wagons.
Tires were always 225/70 with 235/70 available as an option, except in 94, when LT1 cars had to be ordered with 235s or were electronically speed-limited to 130 mph.
Total production for all 1A2 years is 846. Yes, Eighthundred-and-fourty-six. Every now and then, rusted-out, high-mile s**tboxes still turn up at state auctions (where they still sell for around 1.5-2k if they're LT1) but rust free 1A2s are a thing of the past. 4k as suggested above, seems to be a good starting point, but really, you can't put a price on ultra-rare. Pay whatever it takes. Or hook me up with the guy and I will.