G'day George
I've thought about changing the 'radiator tower', but I haven't been able to find a similar housing for the thermostat which has a return coolant line from the Turbo. Let me know if you know of one.
I went with dry liners and standard pistons because I had been lead to believe it had already been rebuilt (it hadn't). Also, if I rebuild again (Frank is my final car) I could potentially press out these dry sleeves and use another sleeve and same standard pistons again, which means no need to find oversize pistons/rings in the future (parts are already bloody difficult to come by with the 14BT), and potentially cheaper, more straightforward rebuild in the future considering resleeving would involve pressing the current liners out, new ones in and then bore and hone again.
I also had quite a lot of dramas with pushing coolant when I purchased him, and after doing the head and fixing some issues with pump timing (too far advanced), I still had some issues when under load, extended highway driving, and with slightly higher boost (if boost was increased to 15psi) with some coolant still being pushed and cooling system pressurizing. As a result, I had a sneaking suspicion there could be a crack in a liner when hot or under those conditions above. Hence, sleeving would ensure there is no crack no matter how minute and give me a bit of piece of mind. When I pulled the head we couldn't identify any leaks or passages that had opened up in the head gasket, so I'm still a bit undecided about the coolant issue.
Not sure if that all makes sense, but there you go. ☺