[Biofuel Frank]

I've been pondering the idea of retrofitting late 70's early 80's vehicles (gas and diesel) such as the rabbit, chevette, omni, escorts, ect, with better/newer emissions components to make the car more ecofriendly. I realize some of these cars mainly the gas ones already had catalytic converts my main idea was cleaning up diesel emissions. I've already tried to research passive diesel particulate filters for older diesels and have only found things for large fleet vehicles. I've also looked for catalytic converters for diesels and found some for the rabbits but I've read that cats aren't very good for cleaning diesels. I've also looked for the selective catalyst reduction (urea fluid injection) kits for cars and haven't found any. I also know some of the cats had smog pumps because o2 sensors weren't installed along with computers so I was wondering if the pumps could be replaced with electronics. My question is, is this retrofitting plan a good idea or even practical? I know that the cats and filters can clog and that a lot of the vehicles didn't have sophisticated computers some had none at all. So that could be a problem