7
not entirely sure.. but what david said may work eventually..
but i maybe on the wrong track here..
but wouldn't u need some kind of call function?
ie when the blocks are used, you have themeblockleft.html for example
and in that html you have this > <div class="blockContent"><{$block.content}></div>
i maybe way out here but u might need something similar
i dunno have a play if it sends u in the right direction it's a start or it maybe completely in the wrong direction..