My 3¢ here. As an owner of an '86 Sycnro (Westy), I'd say that if the body or seam rust is not too bad and you are ready to deal with that, it might be a good starting point.
IMHO the stock 2.1 liter needs to be replaced with something more modern, due to efficiency, parts availability, etc. My choice was the Suby 2.2, there are other good choices as well.
Big brakes are also necessary, which means larger rims and tires. In my case, Audi brakes and rotors were used. I bought a 16" Wheel package from Van Cafe, and have been happy with it. The diameter of the tires is slightly larger than the stock 14" which raises the gear ratio a bit. This is a positive, given the extra power of the Suby 2.2.
Icing on the cake is Euro headlights with relays installed for less voltage drop. LED headlights might be the best choice nowadays.
The power to the front end is coupled via a viscous coupling, which engages when there is a difference in speed between the back and the front wheels.
As they age, a viscous coupling can get "aggressive", meaning it engages far too easily causing problems on high-traction surfaces.
Mine is aggressive, but I installed a driveshaft decoupler which lets me have 2WD or 3WD with quick engagement of power to the front when slippage occurs.
I say 3WD because, the front diff does not lock so one of the wheels can spin in low-traction situations. You can install a locker there too. Those were not offered to the USA market as VW was fearful of litigation from drivers here who engaged the front difflock and lost most of the ability to steer the van. sigh... A Syncro with all 4 wheels getting power can climb some slippery steep stuff! The granny gear helps too.
Syncros are similar to yachts, a hole on land into which you throw money...