I have a 4-link in my 57 with a Nova clip in front. the diagonal bar was/is a PITA for fitting the drive shaft and messes with a lot of other things too. I got the bars for free, made my own frame and diff brackets from catalog and dimensions of my Father in law's drag car (who donated the bars as he upsized). if doing it again, i would use this triangulated kit:
https://welderseries.com/store/Trian...-Kit-p49926314
in the long run it would have been cheaper and faster. a buddy has used other products from this supplier with great success.
Good luck with it