there's a few, but only a few that you can fit under your 289.
-the T-5, in any shape and form will fit the best for the least amount of money(you can pick up a nice used one for 600bucks or so.
or you could opt for a tremic, i haven't found those used, and you'll need a host of other parts to make the swap correctly.
and then there's all the modular 5-speed like the T-45, T-56, and the new tremic trannies in the gts and cobras.
none of those will bolt up to your belhousing or engine.
look on ebay and you can find tons of T-5 trannys for sale at good prices.
matt