Rear leaf spring recommendation for 67 Barracuda

My concern is that the car sits high as it is. You are using ride height to get clearance for tires/wheels that most likely do not fit the car properly.
Good call, that's what's happening - taller tires - taller ride height.
I would normally tub the car to fit the tire size, but this is an original CA car, rust free, and I dont want to cut it.