Ok, to start with you have a few things backwards.
High compression is not at all good for blowers/turbo(s). Superchargers whether they be centrifugal or positive displacement create boost (of course). Boost is merely a measurement of restriction. More boost is more air being forced into your motor. With all the extra air going into your cylinders you are obviously increasing the cylinder pressure. The air/fuel mixture that is channeled to each cylinder with forced induction is a greater amount, yet still contained in the same area. So therefore you want a lower compression motor, to allow for the "boost" created by the blower or turbo. This is just barely skimming the surface, if you want alot of info on it go do some research on turbomustangs.com. There is a huge wealth of information tobe had by reading tech threads over there.
Low compression & Big inches...where does that come from?
Now, you want to build a 347. AFR makes a real nice head, but I have a feeling that the 205 head will be too much for your motor and the 185's wont even reach full potential. That being said what do you want out of this motor? Stock block? What is your power goal? What style camshaft are you planning on? Will this be for a street car or a strip car? We are gonna need more details to provide the best answer here.