How strong is a T-5 transmission?

Yes, I know this question is in the slant forum instead of the transmission forum, but it's a slant based question. I have a 64 Valiant that has many options in front of it since it needs a heap-o-work to be road worthy. I have just about all the parts needed to make these plans happen and I'm doing some idle speculation at the moment.

One option is to take a 318 and either a 4-speed OD auto or one of the many 4-speed manuals I have and drop that in place. However, I have a huge soft spot for slants, and that's what is in the car at the moment. I've been watching @rich_mc and his Torqstorm project, and I'm toying with that idea. I have a T-5 trans and the adapter plate to mate that up to a slant. The question is, what kind of HP and torque will the T-5 handle? I have no intention of building a fire breathing dragon, but a blown slant would be a real hoot, and a sleeper of epic proportions.