velotypo

I have to switch out the engine on my 2004 Silverado LS with a 5.3L. I picked up a used engine from a 2006 Tahoe and everything is looking the same except I see that the coils look different. Can I use the ones from the 06?
I was told I might have to switch out the intake but I do not see any real differences yet (I have not pulled the old engine yet!). Is there anything else I might run into during this project?

Thanks, Chris