I won't get into whether it is worth doing or not because that's your business. As mentioned above, a way to tune it ends up being the expensive part but fortunately it can be done in stages somewhat. For instance if you are using it as a learning project, converting to Megasquirt is a good first step. If you build your own you will need a stimulator to test as you go but either way you will probably be into it about $300-500. But you also NEED a wideband to to get the air to fuel right. Once you have it running and are comfortable with the Megasquirt you could move on to turbocharging. In addition to the properly sized turbo, piping, oil feed and return etc, you will need larger injectors, larger high pressure fuel pump, (Walbro 255?) and adjustable boost referenced fuel pressure regulator. I have done several of these projects including a twin turbo 350 sbc blow thru setup and it really isn't that hard if you take it slow. It's the tuning that usually determines if you blow head gaskets etc and maybe more so with these engines.