Still need to fully prime the engine and make sure it has lube on all the lobes. Make sure you install the oil filter full and get gas up tp the carb so it starts right away. Double check all the wires and firing order to make sure its perfect.
I still use zddp additives on start up but they say they are not needed. Its not going to be in the engine long so figure it wont have time to hurt the cats. But i also dont run cats in most of my cars are older.