Hi. I have a set of heads. They came with my 1970 Plymouth GTX. I want to put them on the current engine that is in the car because I want to take the numbers matching heads and eventually attach them back to the original engine that is sitting in my garage. The person who gave me the heads told me they were milled, and they were milled too much for the engine in the car currently.

Is there a way I can find out how much they were milled? Also, can I use thicker head gaskets to make up the difference? Hope, this does not sound like a dumb question.