As Lucky says, Major has heavy duty scab resistance. What he may not know is that Major is technically a hican. It has numerous DNA markers from C. Cordiformis and some that may come from C. Ovata. Look closely at the nut husk on Major and you will see hickory traits. I will however second Barkslip suggesting Kanza and Hark for your area. This is for two reasons. Kanza does very well in North Alabama and Hark is a good pollination partner and makes excellent nuts.
Here are the best candidates for high scab resistance and good production under low input conditions and that can handle your climate. I am presuming you are somewhere near Manchester TN.
Lakota is well described so look it up.
Huffman (Desirable X Pawnee) is only available currently from a few nurseries around Albany GA all of which propagate on Elliott rootstock. This is not a good combination for your area. Huffman should be fine if on a different rootstock. I have it growing and so far have excellent results.
Avalon (Gloria Grande X Barton) is not yet available from any source. I don’t yet know how it will hold up to colder conditions, but from the parentage, expect it will work at least through middle Tennessee. I am attempting to get trees this fall.
Adams #5 is not to my knowledge commercially available. I have it growing and producing an outstanding crop of pecans in my front yard. Based on observations, I think it will be viable up through Kentucky. The only weakness with this pecan is that it is 81 nuts per pound which is smaller than commercial growers want.
Amling has excellent scab resistance and is an obvious choice for your area. It is a Texas seedling that has done well so far for me. One caution, ambrosia beetles hit it hard this year. I’m not sure if that is an issue or not. Sometimes they just pick a tree and devour it.
Miss L is a Louisiana variety but not commercially available to my knowledge. It is a small nut. I’m getting scionwood in January and hope to have it grafted next spring.
Gafford is another with industrial strength scab resistance. It is probably descended from Stuart based on tree shape and nut form. I recommend getting this one started if you can. It is a type 1 protandrous variety which would complement Hark nicely.
McMillan is not as scab resistant as the others, but it has traits that are useful. It is an excellent producer of medium quality nuts. I have to give a qualified maybe on this tree. I don’t have enough observations on it to be sure how it will perform long term.
Now the bad news. Most of these varieties are limited availability. Bass sells several of them, but they put everything on Elliott rootstock. Some of them are available from Willis, Nut Tree Pecan, Texas Pecan Nursery, or Shiloh. These sources all use southern varieties as rootstock. I have had some trees turn out very well and others that died in a cold winter when on Elliott. My suggestion would be to get some Kanza or Lakota nuts and plant them to produce your own rootstocks then graft with the varieties you want.
If you want to see how this would work out for pollination, pull a copy of the spreadsheet I uploaded and compare varieties. It is linked in the Pecan Pollination chart thread.