I've kept the stock fork.

I cold set the forks for a wider (10mm standard) hub and filed the fork ends to take the slightly ticker modern axles. For widening I just used a threaded bar and some nuts to "jack" the ends apart carefully.

I also straightened the fork blades a bit by sticking the curved bit in a soft jawed vice and squeezing them. This has the effect of lifting the front end a few mm (making for a more relaxed head tube angle, thought I doubt it makes any noticeable difference) and increasing the trail, again making for a more relaxed ride.

The headset bearings were replaced with a standard "aheadset" type set, using the original nut on the steerer to clamp down on the headset. I've added some locktite for peace of mind but it works a treat.

For "suspension" I run 50mm big apple tires on 406 rims. This brings the effective diameter to around 500mm, or just a little bit under the original 451 and 1 1/4" tire setup.

The 50mm tires at about 30-40psi soak up all the road buzz and most of the big stuff too. They roll pretty well too.