Question for vortec 06 swap people

[Lowl!f3]

I have a 06 vortec and tranny I want to swap into my 65.

Now I will be buying a painless harness for this. However there are a few things I need help with to make it happen.

1. Painless harness info says to use a mechanical throttle body. Mine is the electric one. Where can I find the right one that's mechanical? And from what engine?

2. Painless harness says that the injectors need to be Delphi Multec 2 (standard truck style) injectors. How do I know if mine will need those and if it was flex fuel or not?

Help me out here guys. If you have done swaps like this. Please post up anything you know and what I can do.

My engine is from a 2006 chevy and is a 5.3 Vortec. And it does have a throttle body that is controlled by electric throttle pedal not a cable. I want to run mechanical.
I will have to look further into some casting numbers to see exactly what LS it is and what transmission it is.