Well I'll need more info to come to any conclusions for repair. It is of little use to know what you replaced. What is more important are symptoms and test values.

What I can tell you about is what you are working on. You are working on a K-jet w/lambda car. The first and only year it was used on 450s. The previous system that started in 1976 was a plain K-jet with no electronic controls all hydraulic.

K-jet w/lambda was used on V8s from 1980 till 1986 when KE was started. All replacement fuel distributors for all these versions are currently aluminum and only early K-jets used the black cast iron units.

Most important to your car is the frequency of the frequency valve. It can be measured and used to adjust the idle mixture by monitoring pin #3 of the diagnsotic socket on the left fender well. Timing is also still adjustable and very important on that model. I'd bump it 5deg over factory setting.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician