Hydro locking is quite common with a long pipe CAI and if that is the case then best to get it whipped off and replaced with an OEM filter box if you are going the insurance route, that is if you have not declared the CAI upgrade to your insurers.
As has been suggested by Paul, remove all the plugs and turn over by hand.
If it is still locked then I guess that you will have bent valves and piston issues.
I have plenty VQ35DE cyl. heads in stock complete with valves and cams if it is only top end damage.
I also have VQ35DE full engines in stock if you are not so lucky.
Good Luck
Alex.