Ron, the Dynojet numbers (17" pin drives/11" rims/315 BFGs-they tell me this makes a difference in the numbers?)are:
3000/185HP, 4000/250, 5000/325, 5500/340, 6000/350, 6200/345 and we quit the pull.
Comp. cam 236/242, 112 LDA, .55/.57" roller lifters, 2.02/1.6 valves.
Head flow #s: .4"lift/248cfm, .5"/285, .6"/306, .7"/308.
Given the theory that IR manifolds give midrange torque at the expense of high RPM HP, it still seems to me the engine quits pulling too early, hence the question re. TWM (48mm IDF type) throat/Weber manifold combination. As you said, the cylinder doesn't have the 'plenum' to draw from, just the 330/340 cfm throat. Also, why would the Weber carb. do better, with a venturi, unless it's flow velocity, in which case why didn't TWM just do the same????
I'm confused. Maybe we should invent variable geometry inlets, as in 'real' jets
Mike