A T5 is definately not strong enough for your application. It's also not a bolt in. So for the work involved it's not a winner.

833 with od has terrible ratios for any spirited driving. Wide spread between gears and it's still and external linkage.

T56 is a great transmission. Ratios are perfect. Deep overdrive. Internal shift linkage that will feel the same after 15 years. Strong transmission but will require fabrication to install. It's also the best shift quality of all the transmissions considered.