block moves in vi

[Jon Sweedler]

Is there any way to move a block of text in vi?  When I say block, I
mean a rectangle of text.  For example:

what EVER is in
upper CASe in this
senteNCE is part
of a BLOCk of text
and wHATEver is in
lower CASe is not
part OF The block.

So the block starts in column 6 and continues to column 9.  I would
like to be able to pick up the block and insert or overlay it in
another position.  Thanks in advance.