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.
Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.
Chapter Two
| Newby Hall, Ripon, Noth Yorkshire, HG4 5AJChapter Two
| Freshfield Farm, Sloop Lane, Scaynes Hill RH17 7NP UKChapter Two
| Avalanche adventure, Welford Rd, Sibbertoft LE16 9UJ, UKChapter Two
| Highacres Farm, Dewey Lane, Brackenfield, Derbyshire DE55 6DB, UK
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