engine paint prep

yes i have pulled my 400cid out of my car and i want to paint it ...what is the best way to prep and clean for painting block?already pressure cleaned but needs more.....

Lots of scrubbing and degreasing, remove as many external parts as possible, it will lead to a nicer finished product, Id probaly use this as an excuse to throw some new valve cover gaskets and whatever it cheap, and is easily accesible while the engine is out.