Charlie, LVCamaro,
I am not sure of the route up from St. Louis, but if you are taking Hwy 61, which I think you are, to Davenport, you will come through Burlington, just in from the MO border. This is the town Herb Fox street raced "Little Hoss".
If this is the case, you will be just 18 miles from LaHarpe. Maybe if Helen is not going to Davenport, you can just drop in for some coffee and cookies. If you do, just stop by the F&S and Jerry will give you directions to her house, just a few blocks away. The old Gibb dealership is on the 9/94 junction. I'll try and copy a detail map from the area for those who are interested, in at least visiting the old dealership building.