First thanks again for all the great advice and suggestions

Took 40 and will get to Memphis soon (i hope) --took 9 days from LA...
vapor lock and a blown radiator has slowed us down and my dog is miserable. Even starting at 5AM it is hot by 10... not fond of driving in the dark--
So what do you all think about 22 out of Memphis-- avoiding the bridge issue as suggested -- getting to Birmingham --then 20 to Atlanta ??

Remember no AC and top speed of 60.

Id like to avoid Atlanta but i dont want to take an undivided hwy to do that.