I am in the process of a 502 big block swap. I installed the big block frame mounts (tall mount on the drivers side). I bought a crossmember from year one for a TH400 and the mounting pad is off to the passenger side of the transmission mount. The engine is offset to the passenger side which puts the tailshaft offset to the driver side (away from the crossmember mounting pad). Either the engine is offset in the wrong direction or the crossmember is in the wrong location. Any thoughts? I have been told that the big blocks are all offset towards the passenger side but does this mean that while facing the engine (A) the passenger side front corner of the block is closer to the frame rail than the drivers side or (B) the drivers side corner of the block is closer to the frame rail than the passenger side?