I know it’s been asked a million times, but it all comes down to the specific application right? So here is my engine: 286” 8BA 3-5/16 x 4-1/8 1.6” intake and exhaust valves Offenhauser .400 heads Offenhauser std dual New Big 97s (250cfm ea) Mallory Unilite and MSD coil. Currently has a 1007B that was degreed in. Lots of material removed from the valve bowls and tops of lifters. Ports blended and cleaned up I’ve run 8000 miles on this engine in a full fendered AV8. It pulls hard from idle until 3500 and then gets lazy. I have a Potvin 3/8 cam and have been told a 400jr would be the best choice. I want more mid range and top end, which do you think would be better?