Hey dude, if you like your TBI on your Sonoma and you want to put something similar on your TR, more power to ya'... literally.
I know what GM TBI is and I know how carbs work, and they are different. Injecting fuel under pressure is inherently different from atomizing it via a vacuum and a jet with a carb. It's the "fuel under pressure bit" that calls for the extra caution. And yes, I realize that the pressures involved with GM TBI are lower than the typical injection setup, but they're still triple or quadruple the pressure of a carb system.
I'm glad your TBI on your Sonoma has been safe and trouble-free, but me, I wouldn't bet my family's, myself, or my car's safety that some "homebrew" TBI system, (well, homebrew compared to the GM effort, anyway) would be as safe and reliable. I would try to engineer a little extra safty margin - by putting the injectors on the other side of the throttle, where I think they belong.
I know that's no longer TBI in the General Motors sense.
So, to sum up, I think side draft TBI (as implemented in the OP) is a bad idea. GM style TBI is no longer used by GM or any other major manufacturer. (Maybe Holley still sells that Pro-jection?)
The TWM SU style throttle bodies (and Triumph PI throttle bodies) have the injectors located on the throttle body, but on the other side of the plates. So I think that could rightly be called "throttle body injection" as well. Toe-may-toe, toe-mah-toe.
If you don't think that atomized fuel is more dangerous than liquid fuel - well, I just disagree.
Cheers all. I'm headin' home for a /ubbthreads/images/graemlins/thirsty.gif