a14 will bolt to a12 trans, auto or manual, the 4 sp 56a will start to rattle eventually as it self destructs. try and find a 60a 4 speed (used to be cheap, not anymore if you can find one) and if you have $$$ try the 5speed 56 or 60 a (rare as and expensive) or the celica conversion with bellhousing adaptor. its all been covered in the search function before.