"Should the fuel pressure regulator hold a vacuum? I applied my mightyvac to it and it does NOT hold any vacuum."

Who knows, who cares.

Do you have any idea how to do the base set-up and mixture setting after a distributor replacement. If not you now have atleast that problem plus the original one to deal with.

What is your system pressure?

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