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The Smoke & Dart were good tyres in their day ( when I still had all my hair ). The High Rollers can be a bit draggy, but are generally good all-rounders. Don't know what the clearance is like on your retro steed, but bigger than 2.1" may not be advised, and 26" High Rollers are no smaller than 2.1" ( no idea if they're true to size )
26" will limit your choice a bit, and most foldable tyres with any decent rubber compound will likely be tubeless, whether you need it or not.
Bontrager XR Mud ( Badger recommended ) and Specialized Storm Control are both XC light mud tyres and available in 26" .
I'd likely go for an 'all-rounder' tyre like my current favourite Vittoria Barzo Graphene tyres, although these Specialized Ground Control are going pretty cheap at Tredz, with an extra £5 voucher on top of that
TLDR - proper mud tyres will make you hate riding to the trails, so HTFU and use some Gatorskins
Probably mixed terrine. I'll always be riding to the ride I would think so yeah