12" lift for front of 72 blazer?

[lukefalls]

Got it. Sorry for the long, unrelated response.

If your set-up works now, don't change anything. People have been running leafs w/o panhards for years. We just now know that its better to have one.

Look at 87-03 F250/F350. They have flat, stiff springs. They have a panhard.

If you do install a panhard, you may see more responsive steering and less bump-steer.

No, I would not spend the money to build it if you don't need it. Once you have one, you may realize that you did need one.