Valve spring tools, Kirban type and the air compressor fitting to hold the valves up.
Magnet on a stick.
Shop towels.
Cleaning device for the pushrods if they come out corroded, carb clean down them then compress air dry and I put them back in the same holes the same way they came out. I used a wheel to wire brush mine up a bit.
Paint for the valve covers or cleaner for them etc.
valve stem seals , New valve cover gaskets, some cleaner( might as well while there off)
make sure you have the proper tool to compress them. make sure your compressor/ hose is up to the task and the plug fitting you have has good clean threads.
lastly a torque wrench for rocker arm reinstall.
Have fun and enjoy the extra 4-500rpm