There have been a bunch of small block chevy blowers on Ebay this month...Many went for under $800, most went for under $1300. The mini blower gives a quick and hefty horsepower/torque boost to mild engines.
People will tell you about the need for forged pistons, big rods, beefy bottom ends, etc. but the truth is that the small blowers were designed specifically for stock engines, and if you keep the RPM at a reasonable limit, there is no reason why the engine wouldn't perform as designed.
could you honestly just put on a new supercharger on a stock 350?