Big "O" Race

What would be the ideal motor for the 14.5 cubic inch flathead race. Can we run Blockzilla motors? Is it open fuel or can we run nitro and such. How many show up for this class usually and what motors have won it in the past? (ie. stroke, bore, cam)
Yea you did...and I finally found a stroker crank and rod to finish my motor. Just want to make sure I'm headed in the right direction.
Nall was the fastest kart there with a Honda he would have won it if somebody had not of crashed him out while taking over second from the tail!!!!

A limited mod @ 50 less weight can win this race if everything is perfect which is what happened in 2013 it was a good race as it always is....