Not directly related to the bars, but if you go with the new Bilstein HD inserts into the Boge struts (assuming you have the struts with the threads for the gland nut on the OUTSIDE), make sure you have about 5mm of the green part of the insert sticking above the strut body. If you don't, the gland nut will not fully clamp the insert into the strut body and you will get some clunking and play in the wheel. Drop one or more large washers into the bottom of the strut to compensate for the insert being slightly too short.
I wouldn't say this is a "common" problem, but I have had the issue with a pair of later Boge struts I upgraded to in my '69 and one stock '85 without the issue, and seen a few threads where others have had the same issue.
As far as the torsion bar sizes go, there definitely is no single right answer, and unless you are racing and can measure the changes in lap times on a specific course, it's all just "feel" in my opinion. I stayed with the stock sizes on my '85 and went with larger 21 front 27 rear on my '69 hot rod build. Both cars have full Elephant Racing polybronze bushings and adjustable front and rear sway bars, Bilstein sport inserts. I don't drive at the limit of traction so I don't have any objective measure of the over/understeer characteristics, but both are joys to drive and don't feel that much different from each other and are both far better than before the upgrades.
Good luck with your refresh.
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