Not Ranked
There are lots of good rattle can engine paint solutions. If you already had a paint booth available to you I could see using a gun and compressor but since you don't, I would use Dupli-color, SEM or Eastwood engine paint. You are looking at a lot of money to set up just to spray the engine and driveline. And if you plan to use urethane paint, yes - you are going to have to get everything up to above 60 deg and I wouldn't spray any catalyzed paint inside without a breathing air mask and compressor.
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