Again, you will need to know the V.E. of the engine your building to get an exact turbo size for your application. You will need to know how to read a compressor map as well.
Best bet is call one of the vendors here or over on TTF to help you out. I used "Forced Inductions" for the right turbo. Sometimes he is a bit hard to get ahold of but keep trying! IIRC his name is Jose.
I am using the BIG PIG B/W T6 S480 and targeting 8-850hp for my 411" low deck. It has a 80mm compressor wheel with a 83 turbine and 1.10 A/R turbine housing. I opted for the smaller turbine and housing to obtain full boost by 28-3000rpm. The numbers on paper look good but we will soon see when the beast is running.
Your asking for alot of hp for a stock 360! More reasonable at 600hp but what do I know, I'm a newbie too!
I have had a N/A setup over 900hp and ran mid/upper 8's in the 1/4. This turbo stuff is waaaaayyyyy different!!