I had issues getting the LCA's back into my '92 C1500 when I went with poly bushings. The pockets in the frame looked beat up like someone had been in there before and had possibly tightened up the bolts in an attempt to get a few more miles out of it (truck was 225K or so by the time I went in after the suspension) ... but considering I bought the truck at 170K it's hard to know for sure. Anyway I punted and used a porta-power with the claw attachment to spread the pockets a little bit at a time, test-fitting the LCA's, until success.
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Memory is kind of fuzzy on it but I don't recall having those problems when I later transferred that whole setup to my '94 C2500LD. I swapped everything out between the two trucks, in my driveway, after working a 12+ hr shift each night. Only took me a couple days IIRC and no real drama.
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Richard