The difference between the Hiscocks et al, is that they tended to be sailing in new boats, where as we are now sailing "old" or at least aged boats. Having sailed here from Oz in my 40 year old classic, the only extra things to consider are how well found is your classic. With a decent maintainence program, you can just about take it anywhere you would take a new boat. But, you do have to have complete confidence in the level of seaworthiness.