My 906 headed solid cammed 470 made 615 hp and 598 tq on Pettis`s engine dyno and went 10.48 @ 3200 lbs w/my dumb a$$ driving and tuning it. I now run home ported rpm`s and a solid roller Isky cam and went 9.98 so not sure what just a head swap would do but I would think the max wedge port would help a BUNCH. Good luck.