Blown head gasket caused some damaged parts

[Shane@DBPerformance]

I have made in the mid 500s on an Evo with 2 rockers popped off. Fixing it gained a lot up power up top, but it still ran fine, spooled the turbo and made low end power. It depends on how bad the valves are bent too. I made 700whp in my 2G with 8 bent valves from a previous overrev. You have a 2.3l though, that alone should give you a 50whp gain over a 2.0l at the same boost level, so that might be helping.