they generally go for 300 bucks with low miles, or less. So 300 is a good deal on a good low mile blower, but its not something that never comes around.
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they have GT kits to put the 03/04 cobra blower on your car. The M112 Eaton from the 03/04 is not very good overall compared to aftermarket and generates a ton of eat. Its a root blower instead of a much better designed twin screw~ just FYI.
I would not run it without an intercooler, not sure if the kit offers that if not I would pass.
the Eaton vs a Twin screw (KB or Whipple) the twin screw is more efficient, runs cooler, and make MORE power per lb of boost. At the end of it though it doesnt matter as about 450rwhp is the limit for that motor, I would probably keep it around 400rwhp which stock is around 220~-230 in the manual so its possible but the M112 may not get you all the way there at 8psi~ probably will get you around 330rwhp.