Don't be shy!
If you want to get grease off and don't care about the finish of the part afterwards. Easyoff is your friend...
steel wool, scotch brite, sandblaster
so here's the story. i bought a 79 silverado last year. the motor blew. i know nothing abut cars or trucks, so i had to rely on my stepdad's oh so expert redneck knowledge when i bought this thing.