If you can't find the guides; I would just make a set from cast iron bar stock. Or bore em out, sleeve them with a thinner guide and hone to size.
Valves; If not available, find ones that are close in size diameter etc. May need one longer so you can cut new keeper grooves. You may have to install new seat inserts if the original cast iron seat (head ) are rusted and or pitted and can't take a grind.
How bad are the originals? Pictures?
Being a machinist this is how I look at fixing things.
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