here's the 67 Chassis Manual
http://www.teambuick.com/reference/l...ssis/index.php
i don't know your original spring specs but if LOADED ride height is your primary concern you may want to consider installing air bags in the rear.
amusingly, the bigger cars in 67 actually had 'Automatic Level Control', which sounds exactly like what you're looking for.
http://www.teambuick.com/reference/l...files/40-b.php
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