67 Chevy 4wd axle steering arm question

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I was recently comparing the turning radius of my 67 shortbed 4wd to my son's 84 shortbed 4wd, the 84 has a much smaller turning radius. Checked dimensions on the axle steering arms and think that's the difference. The 84 arm is about 2 inches shorter (closer to the tire), which seems to make that one turn further at the tire. Is there a shorter than factory steering arm for the 67 4wd (different than 68-72 arms) so I can keep the original axle, or is there a SAFE way to shorten & weld the factory 67 arm I have.

If I'm off on my thinking here, let me know, I like the tighter turning radius.

BTW, I recently added power steering to the 67 using a box from a mid 70's 4wd and used a metal plate with spacers (approx 1/2" thick at the bolts) so the box would fit on the flat frame. With a little adjusting got the box, tires & steering wheel centered up good. The box I used is a 4 1/2 turn box, while the 84 has the 3 1/4 turn box, but that should be just more turning of the steering wheel for the same amount at the tire. Will look for a 3 1/4 turn box to install soon.