You just need to find a complete motor with all accessories and a wiring harness.
You'll need to buy motor mounts specific for your swap.
You'll need to modify your wiring harness. lt1swap.com helps.
Most truck motors (6.0, 5.3, 4.8) have the iron block and love boost, you can pick up one of those for around $1000 complete and finish the project NICELY for another grand.
An LS1 or LS2 have aluminum blocks and cost significantly more. You'll use your entire $5000 on one of these motors. Not worth it to me. BUT hey, if I had the money to blow, I'd do it.
It's just research research research. Google all your questions and ask people and you'll figure everything out.
As for trans, there are many out there but most use the 4l60e with these motors. unless you get a 6.0, those came with 4l80e's but mix and match as much as you'd like. I'm actually using my good old TH400 3 speed
