I'm rebuilding a LM7, I need some help determining what machining should I have done to the block crank and internals. Reason behind rebuild oil system failed and was ran dry.

A few more questions I have are
How can I determine the year of the motor? ( I heard DBW is 03+,)

What head gaskets should I use I'm leaning towards MLS style with ARP Head studs

Bearing recommendations ?

Valve train
I think ls7 lifters
Ls6 springs
Hardened pushrods
Stock rockers
Cam I am unsure of what cam to get or if I should even can it without all the supporting mods first