With a decent catless free flow exhaust, modified headers, skimming, and a BFI intake it has been argued that 300 is achievable, possible slightly more. With Harry's ECU mod (still WIP) and a shift kit (also avail from Oz) I don't see why 310-320 shouldn't be achievable.
The problem is really getting the tuning parts to this country. The BFI is a DIY job. Exhaust system has to be custom for the V8, due to its dual pipe system. Importing from Japan isn't really an option and I'm told Blitz don't cater for the V8 anymore. The TT is the one if you want to tune it up.
Basically if you want an 11 second V8 over the qtr stretch, you need to design and install your own supercharger and / or move to Australia where they have the expertise and the parts (and the desire to modify).