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I get the impression Continental engineers were just on the cusp of Multifuel engine development when the LDx-465s were introduced. Here's a snippet from a SAE paper written by a Continental Aviation & Engineering employee to explain changes over the LDS-427 model.

FYI, this was the Army's idea of an endurance test for the LD/LDT-465. They were run at 2600rpm for up to 2 hours at a time with one hour periods of idle in between.

The lab test started in 1978 so I presumed D turbos were not mixed and matched onto C model engines at that time. If I am incorrect I apologize.

According to this lab report, the C turbo gives the LDT-465 17 more horsepower over the non-turbo model. That would suggest there's a real power increase relationship with having a turbo. http://www.steelsoldiers.com/deuce/76508-ld-ldt-465-oil-endurance-lab-test.html

I found some relevant information in the attached lubricant fleet study, there's nothing I think this thread has missed, but it does document the differences in a nice little summary. There might be other details of interest in the study of wear on the various engine components in the report...