I have the actual set that were in the 633 Hp 408/360 that Steve Dulcich’s built for the engine masters article. They flowed as advertised and the porting looked SEMA show quality. The only thing that was wrong was the spring pressures were nowhere near what Bryce said they were so I had new PAC springs installed. Get them tested if you want them I had zero quality issues with them the only obvious thing to look at is the roof directly below the spring pocket is very thin (but adequate)

I would get another set in a heartbeat if they were equal to what I have. No sure what set John looked at but they weren’t indicative of mine.