Definitely stay with power brakes. You might consider converting to a 69 style power disc set up. Pretty effective system and plentiful and an upgrade from power drums. Rear are a different story, there use to be something about using S-10 hat in drum style disc, an aftermarket adjustable proportioning valve and calipers and building your own bracket on a 12 bolt but I don't remember everything about it. Maybe someone else can chime in.