Front end rebuild - what's it worth?

I would say the owner does it his self, or be prepared to pay. few people are knowledgable enough to make short work of it.
There are so many variables to consider, Including the possibility of worn out A frames, upper or lower, tired torsion bars, tie rod ends, Idler arms, pitman arms, labor charges to replace all the bushings, and if there are any needs to sandblast worn parts. Then there is the alignment cost.
I say do it right, or don't do it. it takes time, which is why most shops won't tackle old mopar suspensions.
I have been doing them since the 70's, and 10 year ago I charged 1,000 labor not including any other machine shop labor, or parts. The owner was happy to pay it,,,, today I would charge $2,000 labor to totally restore the whole assembly properly. at a full shop today that would be about 12 hours shop labor, plus everything else. Back then When I was $50 per hour, the shops were 90.00 an hour.
But today, I would still decline to do the job, I have way too many projects already! Lol