Speedmaster 1.6 rockers

I recently bought a set of these on eBay because they were $150 (1.5:1). I'm thinking of using them on my mild Street 408. They have bushings not needle bearings, and when I tested fitted them on a set of heads the geometry looks pretty good. I've heard people have used on race motors with no issues. When you consider these as a replacement for the stock stamped steel rockers these would be a good upgrade but I personally wouldn't but them on a high hp setup