that sounds like a good combo with 700hp using the 3.79 crank n/a. whats your bore size and what block?
it would take aleast 20hp/tq to make me move away from my current 4" crank.
peak hp is now at 6600, so another 350 wouldn't be a problem.
i'm not a racer, just go to the track a few times per year to play and see what i'v accomplished. get about 100 street miles per year lately.