I can speak about Furman. If your son is a SC resident, he will probably qualify for the Lottery money. Additionally there is a SC tuition grant that may be available which is currently up to about 3200. National Merit is an additional $1000 if no need, 2000 if there is need. Furman specific scholarships will include the Furman Scholars of 5000 per year (student must be submitted by his school by April 1 of Jr. year so make sure your guidance office does this immediately). The Furman Scholar award does not stack if Furman awards more than 20000 in other Furman money. The Bell Tower, which differs widely for each student, but can be up to $25,000 and maybe a little more. This is the fairly easy merit award money.
Given his stats, he may qualify for the named scholarships (they replace the Furman Scholar and/or Bell Tower). These are HIGHLY competitive and students are invited to an interview process. The big one is the James Duke which provides full tuition and stipends for internships and study abroad. The Hollingsworth (SC residents) and Townes (OOS) provide $35,000 in tuition per year plus the stipends. Depending on your son’s test scores, he may get invited to the interview.
There are other departmental awards that, depending on his major, may be available. The Music department awards a good amount of money if he is interested in continuing his music and probably requires auditions.