well i haven't planned on pulling the motor completely. i have a connection through my dad's shop that can get me good machine work and clean up on the heads for cheap, which is why i'm thinking on going this route. planned on keeping the cam in there too, so basically just the heads.
i recently pulled the oil pan and front cover and replaced the oil pump, timing chain, oil pan gasket, etc. and could see some of the cylinder walls up through the bottom, and what i could see still had factory cross hatching. not to mention when i'm cruising i still have well over 60psi oil pressure (idle never goes below 40) even with this 100+ degree weather we've had. this was the case with the old oil pump too.

this all leads me to believe that overall the motor is still in good shape.
tranny is untouched factory 4l60e. so i don't really want to go very far over factory level performance.

if this is what i do, what do i need to replace exactly. (sorry, i don't know alot about heads/valvetrains) i'm assuming lifters, pushrods, valve springs for sure. what about the valves themselves? or the rocker arms?