Would there be interest in a dodge TBI setup made for our cars?

I'm not sure I would try a turbo with a factory TBI. If you're going to that end, I would probably start looking at Multi or Sequential port injection. Most factory TBI systems weren't really intended for huge hp applications. They were more for commuter cars and trucks.
The Jeep guys are mainly all over the GM units because of the ease of adaptability and the increase in driveability. Trail driving tends to add in goofy angles and dramatic changes in altitude. (It's not unusual to see a Jeep going up a trail on a mountain and having the driver change the jets in his carb). I've heard some groans from the 4.0 crowd about the lack of user friendly tuning on the Mopar Performance injection conversion.

Is the pressure regulator on the Chrysler TBI unit itself? Is there a way to convert it to be adjustable?