[BobS]

bigscoot
I agree with 2000mc on the particulars. I would add to his first statement that diesels, to take the pressure of the instantaneous combustion, are made massive - thus more mass leading to lower rpms. I also would like some limit on the air/fuel mix - optimum ratio just at lower pressure at the intake. And we offer two solutions to your quest.
He suggests multiple injections which I believe is very much a workable solution. I, however, believe that you can use a vaporizer (perhaps ultrasonic with a heater) to modify the characteristics of the diesel fuel to allow it to burn in an otherwise unconverted gas engine. I suggest this since you seem to be time bound and this is the most rapid answer to your project need.