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33x12.5R15's will fit tightly if you put them on the stock rims. Wider rims or rims with less backspacing and you'll have problems.

I've never done this before. Just spoken with others who have. The other parts you listed clearly listed they were for 88 C and K series trucks and not 73-87 (91) square body trucks. None of them mentioned K5s or Blazers either.

That one would work. Look under the tab that says "Applications" and it will tell you what it fits.

That's for a 88-95 body style IFS truck as well. You want one for a 87-91 K5 Blazer/Jimmy, Burb, or pickup with the 350.

That would be for the 88-95 body style IFS trucks.

The Y pipe off of a 87-91 small block equipped K5 bolts right on. GM was cheap and the exhaust manifolds on the 6.2L end exactly in the same place as the 350's do.