A gsr head on a b16 bottom end would be better than a regular b16 because of the increase in compression and having the gsr cams. But would probably benefit more swapping out the gsr intake manifold to a blox,skunk2,aebs. But i would only do this if you had it laying around. An ls-v will make alot more power and torque all around, if done right. Ls block with b16 pistons can net around 200whp with the right head setup.