Don't rule out the old motors, do you think the new generation of motors will still be getting rebuilt 50 years from now like yester years? Hard to say but with the extremely thin wall castings and such its possible the early motors will out live their modern day counterparts for rodding. Besides like I said new motors are only the cool thing till the next generation comes out, old stays cool indefinetly, thus the reason we are here talking about building hotrods and not rice burners!