I would use a Saginaw variable-ratio worm and sector steering box, mounted over the left front frame rail, rotated 90 degrees clockwise from its normal mounting position with the Pitman arm pointing straight down. I'd position it on a vertical plane so the drag link is parallel with the ground at normal ride height to minimize bump steer and use the original left spindle steering arm and tie rod, with all the flex joints converted to modern-type tapered-shank tie rod ends. That setup would be far superior to any of the common Saginaw conversions that retain the Pitman arm in its standard position and much simpler, and safer than anybody's rack and pinion abortion. It would also solve the exhaust system clearance problems the slip yoke to the R&P will create, and be even better than using the original steering gear. If the ride height should end up slightly above or below the original position, the height of the steering gear mount can be altered to correct any bump steer problems that might result from a drag link not quite parallel to the ground.
That's how I'd do it, after building hot rods and round track race cars for a little over 50 years, and teaching steering and suspension to high school kids for a bit over 30 years.
Jerry
