I was considering doing the engine block too though. I emailed the TM9 Ordnance company and I'm waiting to hear back about the heat rating. If I can't find anything then I'll do just the valve cover.
Supra510, I just clicked the link in you sig to find pictures of your cam cover and immediately recognized your wagon lol. I've seen pictures of it before, (can't remember where tho) it's awesome man. Nice job.