Car is a 2001 z28 originally had Ls 5.7 and t56

I bought as roller with no transmission or engine. I have a 2002 LS 5.3 truck engine with ls6 intake and I built it to install.

Have 2002 4l60e as well getting built to install.

I need help with swap. I know I need to have PCM programmed and that's not a big deal but need help with wiring the 4L60E.
I really don't want to swap harness out so does anyone have instruction on pin out and connector needed to rewiring T56 maunual harness to work with the auto 4L60e?

Thanks for help and if I did this wrong sorry new guy and my first post.

 

standalone computer and harness from General Motors (PN 12497316)

If i use something like this standalone system do i need to have ECM programmed and should this be all i need?

Also want cheaper options if possible. ​​​​​​​