Here's what I did,
Take everything out that you can,
(radiator,break booster,hoses ,linkage battery holder,insulation,overflow tank, wiper motor,etc.)get as much off the block as you can.Then you can wrap what's left in cling wrap (commercial size)
you should have plenty of room to sand, prep and paint without having to remove the block.
THen everything goes back all clean and shiny!!!
Good Luck!!
Slugger 66