I have owned 4 SunRunners, a 220CV, 245SB, 280 Classic and now 380 SunBridge.
SunRunner manufactured boats in the state of Washington until 1991, they were expanding onto the east coast, but the economy, poor management and the "luxury tax" did them in.
They built an extremely solid boat, using well known and still available parts.
Get a survey done and if the price is right - go for it!