So found a good old fashioned machine shop in central Ohio ! it’s actually Kingston Ohio , the guys name is Randy Adair , 56 cylinder head is the shop name. The Facebook page is called the same but he has 40+ years of experience in the field , so look him up if you need any work . https://www.facebook.com/profile.php?id=100015925591913&mibextid=LQQJ4d