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Most Surly frames have 72 degree seattube and headtube angles which is the same as many 50s/60s frames. Frames of the period typically had either 71 ST and 73 HT or 72 parallel angles.
650B wheels may be unecessary. There is often enough clearance for 700C with 42mm tyres and mudguards in these frames, although some don't have enough width between chainstays.
A 700C wheel with 40mm tyres has the same outer diameter as 27 x 1.1/4 inch.
benjaminbunny
Stupid question: diregarding components, how different is an old frame from a not-so-old frame? Does a Reynolds 531 from 1965 ride completely different from a Reynolds 531 from 2005?
I'm seriously considering buying a proper old frame, say 1960s, re-space dropouts, add brake mounts for 27.5 and go from there. What, if anything, would stop it from being a (lighter) Surly?