A 440 or Hemi with a front plate and trans mount will flex. Solid mounts on the mid and front plate, flexible mount on trans(you will be cracking tail shafts if you don,t) Trans and engine where easy to remove, the lower 4 holes on trans, this holds the trans when you pull engine, long dowels in the block. I might add if you don't have a good full cage you'll be twisting and braking stuff with a midplate, so i wouldn't it in a stock door car unless you had some type off floating mount.