5.3Lnova

i am researching what i need to do to put a ls6 cam in a 5.3 lmg. i have been told my 799 heads have the right springs but i don't know about pushrod length or if i a can reuse the stock ones. also do i need a gen iii cam timing gear or will a gen iv work. i have also thought about 1.8 rockers and would they work?
i also will be deleting the dod with ls7 lifters.

thanks, robert