Since your car is a 28, likely not much / any adjustments. Price out the later box remedy and then price out a complete rebuild of what you have. In the meantime, read old posts on front end wobble / death wobble. Do all that you can to get the complete front axle, spring and shackles, Tie rod and drag link ends in good working order, including wishbone pitman arm and steering arm balls. All of this must be in order or you will not be happy with your $800 adjustable box. After you cover the bases on the front axle yourself, you might decide that money spent on a stabilizer would only be an unnecessary expense. Might consider looking for a spare axle assy. for parts or to use for a swap when completed.