You can use the CIS pump on the carbs with the regulator (buy a good one, like PMO - dont go cheap) and use the return line on the system because that pressure needs somewhere to go. Quite a few people have done it on this site and you won't find a higher quality pump that FITS and lasts as long as this one. See this - instructions for PMO carburetor install including using the high pressure FI pump with a regulator:
http://www.pmocarb.com/installation.htm
You may still have the chassis harness that goes to the engine with the 14 pin plug. Alot of people stuff it behind the strut towers when they are doing a drop. You probably already checked, but thought I'd throw it out there just in case it was stuffed in with the sound deadener/dirt, etc.
angela