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You need new u-bolts, not different blocks.
I got a 1.5 block kit for my 14 bolt from superlift. I think it was $70 or so for the kit of Cast Iron Blocks and u-bolts. Looked like good quality stuff. 2 inchers should be around the same price.
Autozone sells the u- bolts i want to say for 15 bucks but i cant remember. now what you doing up front to the coils?