Late '69 or later will get you IRS, you can then add Porsche 944 aluminum arms and brakes. You can also graft IRS onto an older chassis rather simply, but may be retaining the linkpin style front end then depending on the year. For front end, you are currently limited to a balljoint trailing arm style suspension, but upgrades include deleting the torsion bar and adding coilovers, as well in the future there will be kits available to run double-wishbone setups with rack and pinion steering.
Jason
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