I'd look at POR-15, VHT, or other engine- and heat-specific coatings. There's one other big brand I know I'm forgetting...
I also doubt anodize would turn out very evenly, but who knows? I'd definitely look into the possibility of changes in dimensions for bearing seats, etc. for anything that has to be ano, esp. if you're looking at hard ano. Plus you can paint stuff without necessarily needing to strip it to the bare casting alone.