I think it should raise the value of the car. You converted it from an antiquaited EFI system to a modern comperter controlled system. You will want to find someone who knows these cars, just tell potential buyers the system improves fuel economy and performance and eliminates many expensive factory parts. All the hard work has been done. The fact you can do the tuning at home is another selling point. If you do upgrade I'd always keep the old parts just in case.
Good luck selling the thing and on your next project!
Good luck selling the thing and on your next project!