Anybody running 10s with a small block and factory iron heads

I flowed a set of stocker heads for a buddy many year ago and it was probably for simplicity reasons one of the most impressive heads I’ve ever had on my bench. It was a free-be job and one that didn’t really interest me because it’s a game I’ve never played or will. I still wish I would have kept a copy of the flow numbers because it got to its max number quickly and never dropped off and went the other way. I know why and how, “valve job angles” and I know it cost 100’s of thousands of dollars to figure it out years ago but these guys that build stocker engines nailed it. Probably 50, or 52, or 55 degree seat angles but when my buddy asked if I could do a valve job for him I laughed and said all I could do is screw those heads up with my simple tools. I told him if he wanted a fast reply ask the shop he bought them from what valve angles they used. Lol . So for the heck of it he did and the guy almost chocked laughing. I’ll just say those heads didn’t hit 250 cfm.