What's the correct way to Prep and paint my 69 slanty.

My slant 6 was just pressure washed. The block has surface rust.

What's the correct way to Prep and paint my 69 slant 6. I'm going to use rattle cans. Should I prime first...With What??

Should I use VHT paint for the slant 6?

Exhaust manifold will be a grey...cast iron? Any suggestions...Any pictures you can share with me.

Any other suggestions.

THX