Vic writes:
If you do this (change the FD) , you will also need to change the Warm Up Regulator to one from the earlier non-Lambda engines, like the 78-79, otherwise you will lose your acceleration enrichment.
If you go this route, you would also need to double-check that the throttle body used with the Lambda CIS has the proper port to feed the vacuum connection on the earlier WUR. I think this port may be just a straight shot to the intake manifold, but it could be located in a place that gives some transition from partial throttle. I think I have both types of throttle bodies, I could check on this if you decide to go this way.