I don't know much (refer to all my threads about things I don't know) but what I do know is that those blocks in the rear look scary. The first thing I would do is get rid of those blocks. Or at least get rid of the smaller one so you're not stacked double like that. The second thing I would do is post some pictures of the front end and the steering set up. If someone did something as shady as double stack lift blocks chances are there is more safety hazards all around.
As for springs, you really can't go wrong with Marlin. They'll give you the lift you're looking for and later on down the road when you start worrying about flex you'll realize, "Hey, these Marlin springs flex great too. Sweet. Who's got some lockers for sale?"
I've got Marlin 4" up front and 5" out back. I was more worried about the added weight of the 4Runner top sagging the rear of the truck, not the front.
Stay away from Trail Gear though. That is just my
