D24 Engine Rebuild Help

[1982 245]

So it turns out the D24 in my 245 is siezed. I am too stubborn to just give up on it so it looks like i'll be pulling it out to get it all loosened up. While it's out I figure I might as well refresh the engine as well. I am currently planning on changing the timing belts, idler, water pump, head gasket, and piston rings. Is there anything else I should take care of while the engine is out? I've heard the bottom end of these is TOUGH so I doubt I'll tear into that.