Switching from 4 whl drum brakes to disc / drum has been a very popular upgrade for years. IMO, the mod is way over-blown. The original and main reason for the mod was brake fade with multiple brake applications - mainly due to poor quality brake shoes. The issue of poor quality brake shoes has been addressed long ago, and unless you are doing some major towing or sports car type racing, you will never realize the expenditure. Take a 1/4 of the $ and upgrade your existing brake system with some quality semi or full metalic shoes and new drums and you will have all the braking you will ever need. Take the rest of the $ and put it in the motor, or some area that you can actually enjoy.