Pulling out the old bragging dad video. But you can get an idea of the workouts.
The other two kids, became teammates and all Cat 1s.
https://vimeo.com/113033767

2 weeks later, one of the kids from the gym is leading out mine for Rogers Cup for a big annual OC Champion of the World win that has been going on since 1976. Cannondale World Tour rider, multiple time junior NC, current U23 NC and a few pros left behind.
They can't match the power @30 miles on the road.
At 100 miles, it is a completely different story. Weights and miles were the most significant thing he's done for double digit length races.
Since then his miles have gone up and power down. So, yea, racing 100+ mile races, I'm not so sure how much the weights help. I still think they do as muscle can be used as fuel (gross), but there is another aspect there.
The 3 kids working out in the gym together all experienced huge speed improvements.
https://vimeo.com/113856699