I believe converting your 35 pu to a 37 to 39 steering box would be the best way to go if you want to retain a stock column drop, column tube, steering wheel, horn/light switch rod, and light switch wiring at bottom of steering box. The locking collar attacked to steering shaft may need to be moved and the frame mounting bracket changed to the 37 to 40 version. The rolling sector gear used in the later steering boxes beginning in 37, gives a significant steering improvement over the earlier boxes that used a fixed tooth sector gear,
The f1/f100 steering boxes would be a good choice on 34 and earlier vehicles.