manifold design is quite crucial.
standard 20v cams are about as much as youd want to go with up to a moderate turbo setup, as they are designed to rev like an n/a and push the powerband quite high into the rev range.
if using a BT head dont touch it.
if using a ST head get the exhaust ports opened up a bit.
my opinion is let the turbo do the work for you and keep the compression low. if you start trying to make it rev more than 8500 you will have a whole host of other issues. seeing as youve chosen your your pistons already you dont really get much choice

definagtely use the 8.9's tho not the 8's as they are just as bulletproof and give a little better response and power.
also a single throttle setup is easier to tune than quads and will save you a lot of mucking around, the quads dont really make any more power either.
my advice is to keep it as simple as possible, then theres less room for shit to go wrong.