Iknow there's turbo stickies all over the place but none really generalize what I'm looking for.

I'm just looking for a general rating for turbo sizes for V8 like ours.
From mild to wild, and what kind of horsepower they could make.
From what I've read a T3 is too small, but thats about as much as I know. I want to run a single turbo, cause " I think" it'll be easier to do. If I'm wrong let me know...

I know Bottlfed did a cheap twin setup, but is a hard to sync the two turbo's in, or is there no syncing required.

 

Two 60 trim T3 turbochargers will make good street type twin turbo system for a 350ci SBC. You do not need to 'sync' the turbos (I get asked this all the time when showing people my car). Twins are fairly easy to fab up, but make sure you know the amount of work it takes (just because it is 'easy' doesn't mean it will be a cheap or quick build-up).

If you are serious about turbocharging, start by reading these books:

Turbochargers by Hugh McInnes
Maximum Boost by Corky Bell

They will show you how to properly size as turbocharger, plus many, many other things you are going to need to know.