Take the heads off, send them to a machine shop have them put new valve seats and polish it for u. Do the work ur self, I reworked my entire engine for 1500 and machined the heads at my uncles shop. First time I even attempted anything like this on a land rover. I have built other trucks but just follow the rave manual. I did mine in the winter at an average of 17degrees outside

 

hopefully, you paid by credit card call and dispute the charge, shop one put the oil separator in wrong, pressurizing the crankcase rather that venting it. causing all your problems.