Hemi Wiring for the Accelerator Pedal

So, thanks for letting me join!! Just picked up a hemi swapped 73 Duster. It's an unfinished project, but it cranks and runs. :)

Here is my issue (keep in mind that I just bought it yesterday, and know little to nothing about it...)... the accelerator pedal (DBW) doesn't function.

The swap is a complete swap from a 2004 Hemi Ram, including the 545. Everything (gauges and all) are there from the ram. It cranks, idles, and will creep around in gear under it's own idle power, but will not rev up. It has a cable ran from the stock gas pedal to the box that was under the fuse box for the hemi. I read that I couldn't re-use this box on the car?? Is that so? Or, can anyone give me any tips or anything to troubleshoot it some?

Thanks a million!!
- Christopher