Single or Dual plane?

I will echo everyone else and say to stick with the dual plane as well.
yes lower rpm is where the average strokers do most 6-6500 and below.

plus more swept volume likes longer runners go's along with what I just said above

once you move the cam out of the range of a dual plane [really big cam] then the single will show more, relitive to what rpm you drive/race in is where you want the power to be.