They respond really well to turbo conversions... DP-Engineering are getting 300bhp out of standard bottom ends using just a decomp plate. If I remember rightly the 410bhp one mentioned up the thread a bit is still on standard crank and rods, just a set of pistons.
VERY strong engines, fair few 500+ bhp ones popping up overseas too.
http://www.dp-engineering.nl
Do a good few bits like manifolds, ARP head studs etc
