I've never done such long road rides close together but I have done continuous comparable long days of mtbiking such as a 6 day trip at very high altitude (1st day went over 10,500 ft) that included 2 50 miles days back to back. We had large cumulative climbs also. I think Veronica is right. Be sure to keep your pace scaled back and be sure to take breaks and eat regularly. I think your eating and drinking off the bike can be just as important to your recovery as rest because it may be very hard to keep up with both while you ride. Plus, your metabolism will probably be roaring for the entire week. Your base training sounds like it should put you in good shape for this as long as you ride at a comfortable pace.