Call Old Irish Dave, and switch to disk brakes. Drum brakes don't work very well and the booster is too light to do disk brakes. Since you are changing boosters, get a good dual-stage 8" with a 1" bore M/C. Dave sells the combination for ~$200. He sells MBM brake components and has them in chrome for ~$25 more. Give Dave a call and tell him I sent you. He's in NM at 575-544-4729.
For calipers, you can either change your spindles to Granada/Versailles type or buy a bracket that uses your spindles and S-10 calipers & pads. This setup is available from Scarebird.com.
Disk brakes will make your car stop just like a modern car. Warning: If you do disks, you will need seat belts for your passenger.
Hope this helps. - Dave Dare