I have them on my '68 Camaro as well, and I have considered putting a strut-type of bar between them that will hold the weight of the car instead of just keeping them bolted to the stock shock mounts. I had concerns like scuncio stated so I wanted to strengthen that area a little somehow.
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1968 Camaro Ex-ISCA Show Car - Sold 
On The Lookout For My Next Classic...
John 10:30
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