Usages of "sic" when citing old spelling
Yet another possible way to handle your problem is by way of introduction. In other words, instead of merely saying:


  As Vanmulken wrote: "Though the fallen curry favor, the publick disregard it much." 


you could say:


  As the Dutch philosopher Vanmulken wrote in 1871: "Though the fallen curry favor, the publick disregard it much."


With a casual mention of the author's nationality and the time period of the quoted material, most readers will be able to figure out the reason for the "olde" spelling, without drawing special attention to it.