I'm absolutely onside with your goal and the general concept of what you did; carburetors suck, but having lived with that TBI system on an '89 D100 318, I would not select it for retrofitment. Its hardware and firmware/software are poorly designed, halfassed and clunky. If I were going to the effort to retrofit TBI, I would use GM hardware -- adaptor plates are readily available and there's an enormous range of injectors to get whatever flow rate you need -- and a reprogrammed GM computer (you can do that with the GM computers, but not with the Mopar ones). See discussion
here,
here,
here, and
here. Adding a vehicle speed sensor is easy; a NAPA Echlin VSS-232 (or equivalent) can simply be placed in line with the speedo cable:
