Re:
Before spending anything, your first problem is the headset. Those cast lugs were rarely used after the late 1940s, and were fitted with loose bearing rings, probably 1/8 inch balls, with the bearings in shear, not like the more modern cup and cone.
Commonly used on millions of cheap roadster bikes other than Raleigh.
See if you can find a scrap old frame with the forks in it so that you can see if the bits fit. You may find that you will have to get them made. The top screwed race was normally 1inch by 24 tpi, and the crown race was just pressed on.
The original forks could have had a headclip.
Keith