Air Shocks 76 Dart Sport
I think you will run into trouble trying to do the axle flip. It's not a good idea. I believe you will end up with "too much" lift. Also you need to keep in mind your pinion and drive shaft angles. Air shocks already change those a little and an axle flip will put too much angle there, IMO. I think you will have better success sticking with the air shocks, or going with a different leaf spring. An axle flip usually results in about twice the lift of the diameter of the axle tube. That would be about 6".
The OP's car is already lifted a good 3"-4" from stock according to him, and he clearly states that isn't enough. From the before and after pictures I'd have to agree, it's lifted at least 3". Using air shocks to lift the car that much will tear the shock mounts out of the car. Maybe not tomorrow, but it won't be years and years either. And the pinion angles are already completely jacked up.
The axle flip should lift the car in the neighborhood of 5 to 5.5" or so, since it will be twice the distance from the bottom of the perch to the center of the axle (about 1.75", so ~3.5"), plus the height of the spring pack. But you won't need a bunch of added leafs if you flip the perches, the stock springs would be fine and the stock spring pack isn't that tall. And of course you're welding on new perches, so you have the opportunity to correct the pinion angle when you weld the new perches on.
Shocks are for dampening the springs, not lifting the car. To lift the car you either need to use a spring with a LOT more arch, or flip the perches. Since the OP apparently wants more than 4" of lift, well, that's flipping the perches territory. The only added issue, other than the amount of lift, is that you'll probably need to figure out a new shock mount. But if you can weld the perches on you can weld a shock mount onto the axle housing, truck style. The lifted springs would be the right way to do it, but in this case the tallest lift springs for these cars are around +3", and the OP is already lifted that much, if not higher. The goal should be to throw the air shocks in the trash where they belong, or at least air them down so they aren't lifing the car, so flipping the perches and using proper shocks should get another 2" or so of lift from where the OP already is. It will handle awful, but if that's what the OP wants, that's the way to do it. I like to joke about 4x4 height, but that's what's really going on here.
