Newbie with Stock leaf spring question????????

[08LTZ]

I just got my first Blazer. It is a 71 that has been mainly redone except for the suspension, tires and a cage. The suspension is stock and the rig has a 5.7 out of a 99' Chevy 2500. The front springs seem to have alot of sag and the ride is horrible. Is it common for the the springs to have what looks like a negative sag to them? What I mean is tha the ends of springs are at abuot the same height as the bottom of the axle. Like the letter n instead of the letter u like lifted springs. I am wondering this because I need to know how much lift to put on the truck.
I was told the truck has a 2" body lift. When I measure the lift spacers they measure 3" total. The rubber mounts only show a little on the bottom of the spacers and the stock spacers are not there. I measured between the bed and the frame and it is less than 3", more like 2.5". The body lift and all the hardware is new.
I want to run 35's. It has 33s now with a fain amount of clearance. If the springs are shot, would a 2" lift be enough to run 35's? I figure if they are as bad as they look I would gain 3"+ out of a 2" lift from where I am sitting now. I was unsure about going with a 4" and being too high and making the 35's look too small.
Sorry this is long but noone aroung me has a old Blazer. Alot of Broncos but none of these. Any advice is appreciated. Thanks

 

[WJACKSON11X]

The springs (if stock) probably have lost some of their height. The negative effect your talking about is normal. Some guys run 33's stock, but I dont see them wheelin' very much without fender trimming. Most are running 4" of lift with 33"-36" tires. Really a personal preference.

 

[TC4x4]

Yes it is commone for the the origonal leaf springs in the front to sag like that, Mine did to, so i put a four inch lift spring in the front and it looked to be like a 6 inch lift in front to what i was used to seeing because the sag was like two inches so it corrects the sag and adds the size lift you get and makes a huge difference, also a two inch lifts springs in front a a three inch body lift which it sound slike you have around there, you should be able to fit a 35 inch tires especially if you have a 33 on now and have space to spair, I ran a four inch lift and easily fit 35's could of goen to 36's

 

[Blue90]

4" would be perfect for 35's, but loose the body lift they are nothing but trouble.