300 hp @ 8 lbs. is a high mark to aim for. The standalone you are using will make a huge difference over an FMU, but not an MF2. FMUs and preludes don't seem to mix too well. Ignition timing control of the standalone will make quite a difference as well I would imagine.
Turbo trim will have a big effect on peak power #'s.
The JRSC is for riceboys with money.