Oh, thanks. That's my forum then :)
I've thought about the T5, and I've driven an LS1/T56 Miata. Yes, there are too many gears. But you just skip around them, and I find I'm always using different ones. I might skip 3rd one time, but the next it'll be 4th. On the track, they'll all come in handy.
I've been led to understand that T5s don't inherently like that much power but can be built to take it. I have to say that a big appeal of my Single Donor Concept is that it'll make it really easy to make work. No matter what the driveline question is, the answer will be "1998 Camaro". I have a T56, so I'll give that a shot first. If it doesn't work, I'll look at a smaller box.
Pictures of the engine will be forthcoming the next time I get a chance to take pictures during the day. Holy cow is that engine a long way back in the bay. The nose of the car is about 15 feet long, and still the rear four cylinders are under the dashboard.