75-76 Aluminum 833 4 speed Overdrive trans questions ?

It depends on the clutch and the tires.

Put some bite on it and I can break every part from the input back with 240 HP.

Trying to put a power estimate on what a transmission will take is a fools errand.

The OD 833 isn’t much different than a non OD 833. It will take whatever you give it with the clutch you use and the tires you run.
So... You're saying I'm a fool for trying to determine if a transmission is strong enough to stand behind an engine. Interesting, Mopar 488 V10 truck engine had more hp potential in it, but was limited to just shy of 500 lbs torque because the trans they wanted to use could only handle 500 lbs.

If you say that I'm ignorant , that is, I just don't know, and Iam seeking enlightenment from others, that would be correct.