Couple of Driveline Questions

I wanted to separate this out of my Chevette build thread so I could get some discussion going without going way off topic on the other thread.

I'm starting to think about driveline options (rear end and tranny) for my Chevette. Let me list some criteria first to give you an idea of where I'm going with the build.

1. Needs to be able to handle around 350 Hp., even though I probably won't go that strong. Not sure about the torque figures, but the most torquey engine I'll have in there will be a 4L Buick V6. I probably won't do that, though because that will be a lot of weight over the front wheels and I'd like to keep it road course worthy. I'm probably going to turbocharge the 1.6L four-banger, but I might step up to an Ecotec if I swap out the engine.

2. Needs to be reasonably light. I'm trying to keep this thing around 2000 pounds. I don't mind adding a bit of weight for strength purposes, but it's not going to see a lot of quarter-mile launches. I might run some autocrosses, but since I live in BFE there aren't a lot of options for the type of automotive activities I like without a lot of travel.

3. Needs to be reasonably inexpensive. I would prefer to find something in a salvage yard. It also needs to have readily available parts if it's something I need to rebuild. Also needs to have some aftermarket support since I'll probably want a posi or locker in there, and I'll probably have to put in a new ring and pinion in the diff. Should also be adaptable to a good braking system.

So, here are a few candidates. First, diffs.

1. S-10 diff. I'm pretty sure it meets most of the above, and I can probably narrow it myself and order some axles.

2. GM H-body diff. It's about the same as the S-10, but it has mounts on the center section for a torque arm. I like the idea of changing the car over to a 2 link with torque arm and panhard bar. I don't totally like the Chevette's suspension setup and the H-body setup would offer some adjustability.

3. 80's-90's GM F-body diff. It's a lot like the H-Body setup but I think it may be stronger, especially the later versions.

Now, trannies:

1. Chevette 5-speed. Pretty obvious if I can find a 5-speed car. Not sure if it's strong enough for the horsepower requirements, and not sure about the availability, especially one in good shape. I think it is a version of the Borg Warner T-5, so it might be OK.

2. H-Body Borg-Warner T-50. Not the strongest tranny in the world, but it lived behind the 200+HP Buick V6 in my 79 Sunbird for a long time. It took a lot of abuse, too!

3. F-Body Borg-Warner T-5. It's a proven design and meets most of the criteria above.

I am willing to consider other options, and might consider a 6-speed if I can find one that doesn't add too much weight and have too much rotational drag.

I'm probably going to run a 4.11 or 4.55 rear gear, so I'm certainly going to want a tranny with an overdrive gear or two if I get to go on a Power Tour or something like that.

Any suggestions or votes? Also, I'm interested in any weaknesses in any of my choices.