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there is no RPM relation to vac retard.
vacuum is max at idle and reduces as RPM goes up.
if that is an idle vacuum retard then it is all out pretty low, like around 1000-1300 RPM
did the 78 have a vacuum retard and/or advance port?
you also have to look at what the WSM says about setting the timing.
to me, the timing setting and the charts never jibe.
if the 78 timing is set to 0 and has a vacuum advance port, then the lack of vacuum would reduce the timing to about 16* which is about right.
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