My son went 13.30 with a 14mm head 5x18's,and HX35/Ht3b, 47RH. Two wheel drive spinning un-boosted launches. Lol, we were afraid the dana 44 wouldn't hold.
Here is my daughter sand dragging with the same set-up less the junk 14mm head.
sam lil nellie bach - YouTube
You got yours coming right along. Think BIG low RPM torque and don't plan on making a whole lot of power above 4k rpms.
P.S. - I eventually tested the Dana 44. It will hold fine right up to 25psi. lol