I have a cm871 isx in a 09 389. The engine is pressurizing the cooling system and am waiting for the oil analysis to come back but fairly certain this thing has a head gasket or liner issue. I am heavily thinking about swapping out the ISX in favour of a 3406e or detroit ddec3/4. Has anyone done this exact swap? I am not worried about the intake/ exhaust side of things, more so engine mounts, wiring harness, etc. Short haul/ local work only and current engine is already fully de regd, with a non vgt turbo. Looking for first hand experience with this swap, not speculation. Thanks in advance.