Nice score Ron!
I've used the oven cleaning cycle to clean cooking residue from CI. I don't think it will do anything to the rust. (And If you ever decide to try that, do it on a day when you can open all of the windows! It put out enough smoke to set off fire alarms all over the house.) For rust I would use a mild abrasive such as a Scotch brite pad or steel wool to remove the loose stuff. Anything tight will be sealed over by the seasoning.
I've seasoned some stuff using the routine recommended here: http://sherylcanter.com/wordpress/20...ing-cast-iron/
Fat little pancakes made with buckwheat flour sound like something I would like!