Scooby pistons can happily take FAR more than 300bhp if on the right management correctly mapped, so im sure Mr Shead will get 350 out fo them for you.
Standard transmission isnt particuarly strong, so not sure what gave you the idea it was, you would be better off with an Evo if you are after that.
Handle great, feel nicely put together, far better car than a cossie really but have a nasty chav image (not that i would let that bother me)