I have an 2005 1500 gmc crew cab with 5.3 in it an I'm
Wanting to put a 2013 5.3 motor in my truck was wondering
What all I'd have to do get it to work

 

58x to 24x conversion box or pull the engine apart to change the reluctor wheel, change timing gear, move knock sensors
You would either run your intake and tb or use an X link to control the new tb with your harness
Possibly a dod delete and cam swap with new timing cover and valley cover

 

To me it costs far too much for the swap to be worth it.

It's easier to just cam the old motor and make more power.

 

Can I take the 799 heads off the 2013 5.3 an put on my 05 5.3 with out having do anything

 

Yep with ease