i can get a set of 799 heads for 300 dollars off an 09 silverado and i have an intake off a 2005 lq4 6.0 out of a van. is the 6.0 intake better than my 5.3 intake? and will it work with those heads?

 

you will need to mill those heads in order to not lose compression on your 5.3, and dont waste ur time on the intake it is the same as you already have. Those heads however should flow pretty good with a port/polish and mill