I only voted no because of the auto trans... You have one problem from the word go - the auto trans relies on engine vacuum to govern the shift points. This has to be changed or the auto will not work correctly. I've driven diesel's with converted gasser auto trans on them and they never properly performed. The gasser is nearly always rev'in higher than the diesel.
The second is a possible problem with your torque converter - the Jeep Liberty diesel sold here only had an auto trans. The torque converter was from the gasser and simply can not survive the torque and will in time break. What is the coverter you have designed to sustain ?
Get a manual, and I think you have something worth while.