1965 5.3 ls swap help!

[Dwolfe]

Hey everybody! I trying to get ready to set up my engine swap in my c10. I picked up a 2007 5.3 with 60k miles for dirt cheap!! and got the harness and pcm. But no transmission. I want to be 100% on what I bought. But i have been trying to look up the numbers on the block. I also have the 799 aluminum heads. How do I have find out if I have LY5? LH6?, LC9? LMG? Someone help! I'm wanting to delete the Afm, and all that and do a cam as well.