The shop manual will tell you the original distance between the shock towers. That way you'll know how much they've flexed inward. You'll need to jack the car up by the front crossmember. When I added my 1-piece chrome export brace, I had to let it sit jacked up for about 30 minutes before it completely relaxed enough for me to install it. I have the shop manual for the 68 but won't help you that much since the 68's were a little wider.
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