Welcome! The only rebuild kits I've seen are on ebay. The Federal Mogul kit seems to be the best bet. I ordered my 4D56 head fromy eBay and it shipped from Australia, it seems to be good quality. Keep in mind since you have a 1983 4d55 head you will also need new injectors. I have a gutted exhaust to a 5" stack, cold air intake, and turned up injection pump.
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