This is what I come up with on my dyno simulation program.
I used the best heads I had available. I assume 4V Cleveland or Boss style heads that morphed into ported NASCAR heads. As I said keep valve overlap minimal. I used a dual plane to keep the bottom end up, which did hurt the top end, compared to a single plane. I did not cheat and use open headers. The mufflers killed a 100 hp and forced more cam (especially on the exhaust) to get the top end. Duration is 225 intake and 250 exhaust @ 0.050" lift. Yes a very wide pattern split.
As you can see the bottom end torque is very respectable in the 375 lb-ft range, and overall fairly flat. 381 lb-ft at 2000 rpm is not going to be a total dog in the bottom end. The hp peaks around 7500 rpm at 506 hp, and is relatively flat from 7500 to 8500 rpm. 496 hp at 8500 rpm is only down 10 hp from the peak.
I suspect building a real engine to these specs would not actually produce the same results. Who knows if it would even be in the same ball park.