Trying to figure out what I'll need and not need to do a front disc swap from my 4 wheel drum system on a 69. Is the metering block I have now (mounted on frame directly below master cylinder) also acting as the residual pressure valve for the wheel cylinders? Thanks for any tips, and by the way, is this project worth it? I keep reading horror stories about a thousand dollars later, not being any better than drum brakes.

No residual valves in junction block 67-70.