Kofi,
I think you had better start again. NAD certainly isn't appropriate for your data (Ghana).
What is the coordinate system of your modern reference data?
Navigate to a feature class using ArcCatalog, right click on it to get the properties page, look at the coord tab.
What does it say there. Please post a snap shot.
The old e00 data, import it into a file geo db please. Do the same, what are the extents, what do the numbers look like (ie small numbers, maybe degrees, or larger numbers, probably some sort of projected metres.
And please don't mess with units (km), until we have the basics sorted out.