Well, just my .02, but the turbo road is a slippery slope. What engine management system are you going to use? What's the compression on that 327? Turbo motors like low compression to avoid detonation and poking holes in the top of the pistons, or busting ring lands.
Yes, turbos can make lots of power, but give me cubic inches any day. Unless you are going for a good gas mileage motor that is high performance, or a motor that has to perform at high altitudes (airplane), or is a diesel, I can't think of a good reason to turbo.
Take this for someone who is making about 280 h.p. from a 1.8 motor on turbo. I have to run a sophisticated programmable engine management system that includes, along with the computer, a knock detector, an air temp sensor, and intercooler. I still have problems cooling the whole system, you pretty much are in constant tuning mode as seasonal temps and gas mixes change. Are you going to change to fuel injectors? Good luck tuning it with a carb.
Not trying to be negative, just realistic. I'd think you could build a nice 350 or 383 with some fancy high flow heads etc. and make 400 or more hp or spend twice or three times the amount for turbos and have something that might be faster but not very reliable.
But don't let me stop you from doing what you want. I'm just trying to say turbos have a lot of their own problems (heat management, knock management, boost management, plumbing management, fuel management)..
