Just to follow up.. After replacing the left front caliper, both front brake lines, adjusting the rear drums and bleeding a full quart of brake fluid through the system I now have good brakes again! The pedal hasn't ever been this firm since I got the car, always felt kinda squishy, lol... Nice clean fluid throughout to boot and so far the master cylinder hasn't died since I didn't push old fluid back into it resetting the calipers. I think that'* what killed the last one.
Thanks to everyone for their help on keeping Betsy on the road a bit longer. Now, off to find the water leak in the trunk