Put the wheel all the way to the back of my 1970 Raleigh Pro when I found I could get the N.R. der to shift on and off a 28t cog that way, but my next canyon ride was weird. I expected the ride to feel different but could tell no difference on my flat ride out and for steep climbing in the canyon, so I forgot about the change in wheel position.
But, having forgot, on the canyon descent I thought there was something wrong with the bike and I stopped to adjust the front brake, check headset and saddle position at one point. It felt like I was way forward on the bike, more than usual weight on the front wheel, and even moderate braking seemed to require shifting to the back of the saddle. This change was easy to register because I'd ridden the same canyon ride on the same bike the day before with the other rear wheel position. Once at the bottom, I remembered the change in wheel position and realized that's why I felt my weight had shifted to the front wheel.
This is likely a chainstay length isssue, not a wheelbase issue, because if the extra inch of wheel base had been split between in front and in back of the BB it would not have felt so different descending. Next day ride I put the wheel back forward at the top just to compare again.
The 1970 Pro is probably more susceptible to this since it seems to have an Italian style tight front end brazed to a roomy English rear end anyway.
On the whole, however, I've found geometry less than helpful for predicting ride--turns out my most comfortable bike in a century is a Raysport with the very short 38" wheelbase.