picking a proper turbo

I'm building a 360 with forged rods and pistons. 10.5 to one compression and I am wanting to run a blow through Carb set up on low boost. Probabaly looking at 6 psi tops. And water/method injection and intercooler to try to keep intake temps down. I decided I want to run a single turbo instead of twin but I Dnt even know were in start in picking what size and type of turbo I want to run. Anyone been there and back or have any suggestions. Seems like everyone runs twin set up, but if I were to choose a good turbo and set it up properly I Dnt see why I couldn't run a single just fine

www.theturboforums.com will be your friend.  10.5:1 is too much compression unless you're running e85.  The single vs twins debate is played out.  Properly sized, a single will spool just as fast as twins and make the same power.  Just twins are a little easier to fit and the plumbing is easier.

Also I have seen lots of people Supercharge and turbo Honda s2000 and they have 11 to one factory. And they have 6 psi kits that seem to work pretty well with their tuning stuff

That's true. I was thinking maybe a fuel injector in the Carb bonnet for when under boost and water/method injection would do the trick. Guess I will have to see how it runs and how prone it is to detonation after I get it running. Waiting on head studs and rockers and pushrods right now

There's much more to an engines ability to deal with boost pressure than static compression alone.  head design, manifold design (intake and exhaust), fuel delivery method, ignition design, etc, all have huge effects.  I have to get moving but if I remember I will elaborate later.