66 poly 318 trans behind 340 in 71 Demon.

The problem I am having is the torque shaft runs up hill from the frame bracket to the trans bracket, I am aware a /6 trans does not work behind a small block. I was referring to the shift linkage possibly being a mix of 904 /6 and v8 727 parts. The rod length from steering column arm to torque shaft appears to be right it seems trans side is too high.
Thanks