Flat plane crank

The shop I moonlight at is sciencing out a 306" W8 head Comp motor. It's been held back because of a few mistaken assumptions; doing dyno pulls to 9000 rpm to save springs(it'll go to 10k and change, but springs last less than 5 pulls), it's at about 700hp. That's not where it needs to be to be competitive. Going back to step zero and flowing the heads, it turns out they're way short of what they need to be at about 365cfm at .800. Ported by a "real good guy" but no real flow testing....

Anyways, that problem is sorted and progress continues.

This guy has more $$$ in dyno testing than all save perhaps a few people(me too) here have invested in their motors(tall 5 digits). 90 degree crank (Winberg), so I strongly suspect that flat plane cranks are not worth the trouble associated with them. S/F....Ken M