One of my closest car buddies uses a PHB on his 69. It's a simple home made set up using a PHB from Speedway Motors. He road races it at Sebring, FL in SCCA Vintage class. While the PHB may not be as precise as the watts link, it's real cheap to build and it provides a significant improvement in lateral movement over just the stock leaf springs. Keep in mind that both the PHB and watts link will create exhaust routing difficulties.
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
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