350whp is a low low 11sec car.
can do it on stock internals but always nice to upgrade to pistons.
i would go:

MSnS ecu
T3/T4 60-1 turbo
ported stock exhaust manifold.
240sx t-body
pallnet fuel rail
adjustable fpr
walbro pump
supra injectors.
custom downpipe
custom 3in exhaust
misc gauges
electronic boost conrtoller.
maybe the ford edis system for ignition..

not much more and your around that power on pump gas and a mild tune.