Bell Housing Stuck!

If you have all the bolts out and trans out etc,... its likely stuck on the dowels [dowels rusted a little and alum on the housing corroded.. ]. What I do is take a small straight screw driver, and with a hammer lightly tap the end of the screwdrver in between the bell housing and the engine block. Dont go nuts pounding it all the way in. Once you have gotten it to move a little go over to the other side and do the same, do this in a few spots and it should reach a point where you can muscle it off. Good place to start with the screwdriver/hammer would be close to the dowels as possible.

wedge a screwdriver in a lightly tap it in on each side until it comes off. Pretty much what Schlodes said ^^