Seems like a bargain.
I just spent 85.00 having a block and set of heads baked , and they came back cleaner than I expected.
I believe the EPA has some issues with the caustic soda soaking process.
I don't know anyone that does it anymore , but the problem was what to do with the residue inside the tank after doing a bunch of parts.
At the tech school I went to , they drained the tank , then shoveled the remaining goo into a 55 gallon drum.............this was early 80's and no one cared much how you got rid of the sludge.
Now , you could probably still do it , but the permits would not be cheap.