225 quandary

Part of the car parts that I bought included a rebuilt 225 (1987 block)that had been built for drag racing . All I know about it is that the previous owner had it rebuilt for $6000 and then decided that he wanted to go a different route. Somebody wants to buy it for cheap but I'm not sure if I should just dump it. Should I sell it for cheap as is, or should I take it to an engine shop to have them run it to get some performance specs so I can get a bit more for it. The motor is complete except for the intake and exhaust manifolds, and the carb. Is there even a demand for racing inline sixes? What should I do??