bigwig

I've been looking into buying a Turbo for my LS for the last few months and i think i found a good deal. i just have some final questions.

The setup i plan on running:
18g turbo
blitz bov
charge pipe
all piping
spearco fmic
down pipe with o2 sensor already attatched
walbro 255lph fuel pump
vortec fmu 10:1
rc 310cc injectors
oil feed line
oil return line
oil pan tapped for turbo
hks b series manifold
$1250 + shipping price.

Now do i really need a hondata or Apexi SAFC if i only plan on running 8 psi on a daily driver?
Do i need to get bigger injectors than 310 cc for only 8psi?
Exhaust. 3" Mandrel bent exhaust with a high flow catback a good choice?
Anyone know any good/inexpensive shops in the NJ/PA/NY area that i can get this installed?
Any suggestions on a clutch to use?

Thanks.