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The PV is unstable in cross winds due to its shape, a big and ugly rear wing would probably cure that, not something I would do.
Also the engine is set back further than the 122/140 which makes the PV more responsive but less stable. I had a PV with almost exactly the setup you have, ( 5 inch rims, 165 tyres disc brakes ) I think its limiting factor in terms of roadholding was the tyres, 6 inch rims with decent tyres and some stiffer springs would improve the roadholding, I don't think it would do anything for the stability in cross winds etc.
I have another PV which is turning into my life's project with 140 suspension, as I haven't run the car I can't tell you if it works, it was quite involved though.See
http://volvoadventures.com/544PVHans.html
If you are looking into this 140 suspension on the front is the best fit, 240 on the rear has some advantages ( anti roll bar, handbrake set up )
With the benefit of hindsight I would stay with what you have and fit springs wheels and tyres.
Ciao
Hans
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