Right or left, from what perspective? The normal bellhousing has the clutch fork coming in from the driver's side, while the late-50's pickups had hydraulic clutches, with the fork entering from the passenger's side. Does your bellhousing fit a 6-cylinder, or a V-8? I've got several hydraulic clutch V-8 bellhousings, and I know where a manual-clutch V-8 bellhousing is that I've been intending to purchase, and just haven't gotten around to doing it. These are the ones with motor mount bolt holes in the bellhousing. Sorry, I can't help if it's for a 216/235/etc. engine.
Jerry