The point is that the system runs at low pressure; that is controlled by the system. Any pump capable of sustaining 30psi will accomplish the job. Volumetrically a V8 pump of that era will do just fine. It may require a new bracket and modified lines but nothing was very special in the way of lines in that day.

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