NOOOO do not get lightweight pushrods. They are not stronger and are more prone to bending. Keep your stock pushrods
Springs (105's, LS6 or L76)
LS Retainers
Valve seals
Reusable rocker bolts
Valve cover gaskets with grommets
LIM's (aluminum GM)
TB gasket
Coolant elbows (Dorman 47065)
Cleaner
Gasket scraper
Coolant
Oil change (automatic with LIM's)
PS fluid (while the alt tensioner if off, it's the best time to top it off)
Plugs/wires if they are in need.