[Proj] Help translating NAD83 coordinates to WGS84

[Chad Wallace]

Mike,
 
I stumbled across this site in search of projection issues. I work with
a program called MapInfo Professional, and the street files we use is in
the NAD 27 format Tiger data. Then we purchased the update which was
Tiger data using the NAD 83 projection. Once bringing the two on top of
each other there is huge differences. Is there a fix to convert our data
fields? Also what is the difference between NAD 83 & WGS 84?  
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