Screw the blocks, use the leafs only if they are for the 2" you want. What's the numbers on the suspected rear leafs?
I used 2" aal from Rusty's for my rear end and the number was ROP 2564. I didn't want blocks for my terribly fatigued springs.
Here's my thread if you want a long read and a bunch of pictures:
1990 Grand Wagoneer-"The Crapwagon"
AMC 360, TF727, NP229, 3.31gears, 2" lift
Rancho 44044, Rusty's 2" AAL, TFI
...not too rusty anymore
Plenty of patina
1926 Dodge Brothers Business Sedan 212 I4-CRANK START
1987 Lincoln Town Car Signature Series-5.0 AOD (WD)
1987 Dodge Dakota LE 3.9, A999, 3.90 gear (DD)
1994 GMC 'Burban 5.7, 4L60E, NP241, 3.42 gear (DD)
2001 Jeep Cherokee 4.0, AW4, NP231, 3.73 (limbo)