I have the head off my M20. I am taking my time and cleaning everything up as it was very greasy fom leaky valve covers. I was wondering since I'll be putting on a new head, should I take the oil pan off and clean it all up inside.

Is it woth the effort? How hard is it to do? My Bentleys makes it sound fairly simple. It doesn't mention having to raise the engine. Is that right?

Also, short of bead blasting, is there something that will clean parts like the intake, T-stat housing ect?

Thanks