kool stop or swiss stop are the best imo, possibley the best pads from back in the day, they can still be got, but i dont know if they are still being made or if the many that are about were made BITD, either way they havent changed so would suit the build no problems.
The vbrake design pads but with stud holders. fibrax make them. you can the pick your rubber to suit. I like the triple compound versions for mud and winter. in fact even for the dry but not needed so much then.
a search of the forum will bring up this question a few times.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.