Looks like you're sticking with drum brakes so lets not try to re-engineer your car for you.
I Utah & Spudaho we have Page Brake that do brake reman stuff but any quality brake reman company should be able to help you. They do a lining that is designed to survive excessive use in light trucks.
If you end up with a bonded brake lining, drill & rivet it as well, the excesive heat build up will want to delaminate them. Cut heat breaks in them, three seperate sections on the lining with 1/4" gap between them to help release the heat. Use the thickest drums you can find & drill them just like you would a disc.
Anybody remember "brake fade" ??
Back in the early 70's we ran a 4 wheel drum brake Group "E" Chrysler Pacer (Ozzy Dodge Dart-ish) in the Bensen & Hedges 500 in NZ. We learned how to make them work but we still changed them every 100 miles or so.
Racing drum brakes is probably a lost art by now.
Sid.