Interesting. It's the HG. Looks like even on the cheap end, It's about a $600-$700 in parts. My mechanic isn't thrilled about having to drill and tap. He's a friend of mine and will charge me $600 to do both heads. Thought process is if I can find a later model lower mileage engine, it will ultimately last longer. I'm finding a few for under $1500, my mechanic is saying he'll charge me $450 for the engine swap.