Will do. I have an old set of 24" rims on a 55 Huffman I may take back to Minnesota to experiment on this summer and tackle the Elgin wheels next winter when I better know what I'm doing.if all your doing is upgrading the spokes to a thicker size, you just need to measure how long the original spoke is. most places measure spoke length starting under the "L" bend to the end. might wanna check from where you're ordering to be sure how they do it.
also, if you are adding thicker spokes, you'll probably have to drill your hubs and rims to fit. that's common practice, and won't affect the strength, as long as there's enough metal on the hub to begin with.
just make sure you get the right size drill bits
SB