The ideal weight of 2lbs/inch is good for a pro that climbs mountains on a bicycle to make a living. I’m 6’ and 188lbs and could never reach that ratio and still be healthy enough to ride a bike with my body type @ 144 lbs. A better indicator is watts/kilo of body weight. For the type of ride you are going to do you will need to develop strength and endurance that allows you to ride @ Z2 for hours. The higher watts that you produce while sustained riding in Z2 and Z3 (getting over mountains or fighting headwind) the more prepared you will be for the ride. A training plan that incorporates higher intensity intervals will raise the body's ability to produce more watts at the same HR.

I do about 2.5 hours of core/resistance work a week. My routine does not include lifting big weights but rather doing pull ups, pushups with my extremities on medicine balls, squats while standing on medicine balls or a upside down Bosu ball, and various core drills.