Not really. The pistons are not really suitable for FI, either, so they would also need changing. You will also need uprated studs, head studs, head gaskets, crank regrind, new big ends (whether you uprate them or not, is personal choice).
Like I say, the costs are mostly in labour, so just changing the rods alone wouldnt be very cost effective in the long run. While you've got it in bits, you might as well do the job properly.
What I've described above, is a basic bottom end upgrade.
But if you knew you had a bottom end that was capable of holding much more than 400bhp, wouldnt you want to explore the realms of more power????