You probably know this already but theres a loaaaaaaaaad of threads about the K04 conversion
In short, YES your standard internals will cope fine with 330-340bhp the K04 conversion gives. You may wish to consider an upgrade if you decide to go for WMI or NOS
James was running near 400bhp (and thrashing it everywhere) before his BWA engine gave up (after 8k miles)
The rods are the weakest point and are the first place to upgrade.
DSG map is recommended (although I'm no DSG expert)
Graeme