If buying a salvage title viper, get it up on a rack and have a look at the frame. Have a professional look at the car. If everything checks out, and the price is right, it can save a bit of cash. I've seen several Gen IIs sell in the low 20s, a few Gen Is I saw sell under 20. When I bought mine I couldn't finance it because the title wasn't currently registered anywhere (was still on a NJ salvage title being held by the finance company for the rebuilder). As far as that goes, many banks won't lend on something over 5 years old. If you plan on financing, it might be easier to look into another car. I'm sure any dealer that has a Viper listed can arrange financing, though it may not be a great rate.
Anyway, after I paid for it I had to bring it down myself and apply for a rebuilt title. Mileage shows as "exempt" even though all of the mileage was updated with title changes etc. This could hurt resale, but I didn't buy the car with any intention of ever selling it. If you already have reselling in mind, consider one that hasn't been wrecked. I had no issues insuring it with State Farm.
I'd be leery of a car that's been flooded, especially something from close to the coast from a hurricane, etc. Saltwater and electronics don't mix well.
So far, no regrets with mine. I don't have an answers as far as California is concerned though, sorry.