Depends how long the stuff will be stored. I used to put oil or grease or Cosmoline blocks and cranks but I eventually figured out that when I store something it sometimes sits for years and years. So these days I just paint the parts after getting them hot tanked. Shoot them with some rattle can paint on all of the machined surfaces and then 10 years from now when you decide to use the block or crank you just get it hot tanked again.