Jack, pads and rotors are new, and yes, I went from a '74 Corona front setup to a '04 corvette. I don't know what the bores are exactly, but I've gone from single piston toyota setup to dual pistons on the new setup. I'm fairly certain the new setup has a significantly larger effective bore than the old. This is something that I can measure if the residual pressure valves don't do the trick.
They have been bedded in, and I am getting excellent stopping distances from them. Once the pedal goes in the initial couple of inches and i'm able to apply light-to-moderate braking force, the brakes work fantastic. They have just the right level of effort, and the pedal travel isn't that much after that point. The problem I have is that there is much more travel to get to the point where I can apply braking force, and as a result, the pedal has gone too far in for my foot to reach the gas pedal for heel and toe.