Hello davidmo,
You could use the "Replace" feature.
1. Do a "Lookup" to find the Contacts that you want to paste the info to.
2. "Edit" select "Replace"
3. The fields will all go blank. Paste the info into the field(s)
4. Click on the "Replace" button.
Note: You cannot undo this action. So, I would suggest backing up the Database first.
Hope this helps,
Michael