How much different is a lock-up 350 from the older turbo 350? I am considering using one in my truck. My current transmission is almost dead and most certainly will not survive long with a new new engine turning its input shaft with well over 420 ft lbs of torque. I don't really want overdrive because I have 3.07 gears in my truck and the overdrive will put me at something slow like 1800 rpm on the highway, making the truck kind of sluggish. That and nobody seems interested in the 350c's which makes rebuildable cores much cheaper than a th700.