rear axle flip

Could you flip the front leaf spring hanger? Maybe have a spring shop add a leaf or two on the bottom that are only a few inches long just to add height and use longer U-bolts?
Flipping it would probably raise it 3.5".
3" tube + maybe a 1/2" for the perch?

Trust me, it's gonna be more. Imagine from the axle center line to the leaf spring pack. That's probably close to or over 3". Now, imagine flipping that to the under side. You have the 3" from the axle center line plus "however" thick the spring pack is, because now you're on "the other side". He'll get a good 6" or so. I've done it on trucks a good much and it's always around 6-7". It's a big difference.