I assume you have enough power in the sub channels to drive a pair of 10's adequately -- 100 or 150 watts of sub power would be plenty.
4x55W, 2x110W - so yes, 110W per sub

Keep us posted on what you do, and put some pictures up too.
I'm assuming by this that you haven't seen http://www.v8mgb.com. Not much yet, but I'm gonna keep it updated.

Thanks _again_ for your help : )

Sally

tanstaafl.

"There Ain't No Such Thing As A Free Lunch"