Questions about electrolysis rust removal

Just put together a setup and have done a few tools with success but I was wondering a couple things that I can't seem to find much info on.

If the part is too big for the tub, can you let one end of it stick out of the water and then flip it over and do the other side when you're done or can this cause problems aside from the obvious danger if someone touches it and shorts themselves?

Also has anyone ever dipped an entire intake? I have a cast iron intake that needs some rust removal but I'm not sure how it'll react since the cast iron is more porous than the tools I'm cleaning.