GMC V6 to a V8 small block

[Erl]

Fast68,
I have had several people try to sell me just the frame motor mounts, others say the cross frame cradle is also needed. I do not see any additional bolt holes to move the cross frame, but this does not mean that a V8 cross frame is the same. It could be shaped differently. The V6 has a complicated bracket on the engine to position the actual motor mount. This leads me to believe that the frame cross cradle is universal. Surely someone knows for certian.