Help me fine tune my setup, please

[67Monster]

Just picked up a steal of a deal on a complete engine trans and all accessories. Would like to do some "small" modifications while I have it all out. Looking for any and all feedback I can get.

LQ4 2004 103k miles, 4L80 trans, 3.73 rear

This is not quite a daily driver, but close. Looking for low/mid torque. Have no desire to hit 120+ mph. Have no desire to have sub 10sec Times. Will never go to the track or road course. Will pull a mid size trailer from time to time and 27 ft camper. 16+ mpg would be a major plus. I do want some extra "get up and go".

That being said, I will be adding LT headers, refreshing plugs-wires, water pump, timing chain, New cold-air intake, pro tune.

Now, this is what I was considering to add: Holley mid-rise intake, New TB, slightly larger injectors over stock, New fuel rails, valve covers, custom cam. Keeping stock heads or finding a deal on 799/243 set. Don't want to pull the heads unless I find something great. Stall only if necessary.

Complete overkill?
Waste of money for this application?
Better off spending money on "x"?

Have been searching the web for so long but can't find anything specific to this type of setup.

Thanks