Is there a block lift kit that will fit a 69 Barracuda

Air shocks are an option I was considering. If I do air shocks and use that to lift it I assume that The higher I go the stiffer the rear suspension gets resulting in a bumpier ride?
(Which might not stop me.)
To get something, you have to give something. Also stiffening the rear will cause the front suspension to respond like a boat bouncing on waves. Your front shocks must be in great working order.