You established spark, now check voltage to fuel injectors. Use Volt meter or test lamp across any one of the four fuel injectors plug. You will need to have meter or lamp connected while cranking engine to see if voltage pulses on and off.

Suggest you grab camera and look under the chassis. How much rust is there. Also, look under the carpet inside the cabin. You may be surprised as the photos you sent may just be the tip of the ice berg. I have spent a whole year looking for another 740 that was not rusted or so badly abused you don'...