new here, please help me understand what LS engine I have

[my kids toy]

I will be doing the LS swap in my 72 short box I am building for my Daughter.
I picked up a driving 1999 silverado truck for all the parts I need.

I do not know what model the engine would be or what other model parts are interchangeable.

I want to get some after market parts for it but I get confused with all the different models and what fits cars and what fits trucks
I want to switch out the intake and would like a chrome or polished intake similar to the Holley sniper but seen on summits website it does not fit the 96-02 truck motors
I also see similar models of the sniper on ebay that are no name models are they good intakes ?

I am going to have the engine torn apart and have it refreshed with just a mild cam put in it so what size throttle body should I stay with ?
I am looking to dress the engine up.

Thanks for any help.