You can run sphericals in all 4 ends...in fact, I would recommend it over the PM3L. Call Wolfe Racecraft in Arlington who puts 1500hp through the stock design.
http://www.wolferacecraft.com/detail.aspx?ID=267 I think their claim to fame is 7's on the stock 4 link. Since bushings are open, install a heim in the stock UCA and go to town. You are going to get a TON of gear noise and you will need to up your rear spring rates to account for the lack of bind but the PM3L guys are already doing that.
You guys are over thinking this and just need to run the right bushing setup that isn't overtaxing half of the stock design and just gusset the pickup point as the CMC rules may allow. Problem solved and you keep $750 in your pocket.
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