No need for a throttle position sensor, at least not if you use a Dicktator, it uses a map sensor to determine manifold pressure/vacuum, and according to that works out how much juice to spray. I took a hacksaw and removed any evidence of a TPS from my throttle body, and my car has been running just fine like that. The webber idea could work, as they would just be a means of controlling airflow. Just make sure you plug all holes properly, so you don't end up with air leaking through the old fuel passages.