Stock and super stock guys are a different breed and they pay real good money for those valve jobs. I flowed a set (small block Mopar) for a buddy of mine and they hit a certain number and never went up and didn’t fall like most of us struggle with. He asked me if I could freshen his valve job for him and I told him absolutely not. I said if you want to get a good laugh ask the previous guy that did the valve job what angles he used. He called me the next week the guy laughed at him. Lol. Trust me it’s not. 60-45-30.