I've used it before on an intake manifold with good results. I used a small wire brush to get at the crevices, but the oven cleaner product worked pretty well. You need to neutralize it or you can develop rust beneath a painted surface and have the paint bubbling up in places. Actually, I used this on a surface I had previously cleaned with a vinegar bath and then some Awsome, a product from the Dollar General. That part was downright nasty with grease, grime and debris prior to using all of this, but it turned out great, afterwards.
Good looking piece. Congrats on how well it cleaned up.
Here are some old photos of a Toyota manifold I had started cleaning with some Oven Cleaner and some Awsome. The black piece shown was a rubber piece on it. It only took a small bit of scrubbing with a small wire brush to remove all the junk in the crevices to that part. It started out mostly black with grease, grime and debris before the clean up process. It does not have to be Easy Off, as they make a grill and oven cleaner that is sold at the Dollar stores and it works every bit as good as Easy Off and is actually much cheaper per can.