Randy
Don't know if you will be heading this way through St. Louis - but there is a lot of construction going on on what was formerly highway 40/61 - now labeled as highway 64. A major section is closed from downtown St. Louis to it's outskirts. This is a major issue locally and causes many to consider alternate routes.
Just something to know...
Highway 70, for the most part, is ok - just watch out for major pot holes. You will be able to make it from IL through to KS via 70.
Also watch your speed near overpasses here - the cops have all kinds of little areas they hide. They also make a point of coming out in mass a couple of times a month to enforce speed limits. If you get off the highway - there are some areas that have traffic cameras at stop lights - but it isn't as bad as some states yet.
