A 400" big bore, short stroke, 10,000RPM big block is a pretty exotic piece for most people reading this.
A single 4 and correctly sized heads won't need 10k. 8500-8800 is a pedestrian RPM today and that should be all it would need. Also, cam timing would be relatively short. That's also a bonus. The better the head, the less timing you need to get the same RPM.
An all out W8 headed small block will make peak power at around 10K, willmake around 2.7-2.8 HP per cube. I don't see a B1 original head matching the HP/ci at under 9K. They're a 30 year old head design. I think the fact that they weren't ever really taken up in Super Stock or Comp Eliminator if fairly telling. I think we're going to have to agree to disagree on this one
