Yes. After much consideration, research, price comparison and the intended use of the new brakes versus the old brakes, I have decided not to convert. It should be cheaper to rebuild than upgrade, they are not going to have the stopping power and I loose the factory park brake, so I would have to find a solution for that as well.
So when it's time, I'm just gonna rebuild the front and rear brakes and not worry. She's been stopping like that for 40 years and will be just fine for another 40. Plus they are good when towing.
Thanks all for your opinions and help!