My 50 still has its original 216. I swapped an S10 T5 in place of the 3 speed, and a 3.90 Task Force truck rear in place of the 4.11 and torque tube. It cruises 70 at a happy 2500 rpm. First gear is a little short (usualy shifting before I've cleared the intersection at a 4 way stop) but otherwise it's a great driving experience.
