So I have ECZ-G heads that are off of what I believe by the numbers to be a truck engine. I am about to send the heads in to have them checked and the hardened exhaust seats put. My question is, is there anything to ask to have done or not done to them while they are at the machine shop? This is my first engine build, and being a Y-block, I have a lot of questions. The shop I chose to have the work done at seems to know about the engine, so that is a plus. Im just not sure what to ask them to do to the heads or what not to have them do to them. The engine Im building is going into a 59 Fairlane Galaxie 500, Im not looking to make a "race car" or anything. Just a little more power than what it came with. I have the 9425-B intake manifold. I would like to put a cam in it and probably a different timing chain as I have heard that this will make a difference. Any help would be appreciated.