Piston connect to crankshaft?

I need to send block to machine shop for new cam bearings, but I would need to take off piston and crankshaft. I can take it off but I'm not too sure how to put it back together. I don’t know spec’s / torques / balance / timing. Whatever is needed to install back. I’m unaware. Can you please help? I'm not changing anything else out no other bearings or anything, just installing it back together. It’s all original.
Just putting a bigger cam it's a ls lm7. thank you