On IFS's...Maybe I'm too traditional, on an open wheeled car they just don't work for me. A T bucket is a light car. I don't see any need for anything other than a Ford type leaf suspension. I prefer simple, uncomplicated suspensions. Now if you are talking a full fendered car, that's another story. Change for the sake of change isn't always good.
On the half rack...That's the cleanest setup of that type I've seen. However, I would be a little conserned about the tie rod ends at the center pivot being so low. You would have to be careful where you're driving. I'm also curious about bump steer with this setup. In the suspension travel, the toe in would change with the position of the spindle in the travel. This would cause a toe out at the ends of the travel. I would think one drag link running from the bell crank to the right hand spindle, with a tie rod running to the left hand spindle, would be a better setup.
On the half rack...That's the cleanest setup of that type I've seen. However, I would be a little conserned about the tie rod ends at the center pivot being so low. You would have to be careful where you're driving. I'm also curious about bump steer with this setup. In the suspension travel, the toe in would change with the position of the spindle in the travel. This would cause a toe out at the ends of the travel. I would think one drag link running from the bell crank to the right hand spindle, with a tie rod running to the left hand spindle, would be a better setup.