The K551 includes a K&N air filter, air box, fittings, hoses for the PCV, fuel line, adapter plates,gaskets, bolts, linkage, etc. It is a conversion kit so it has everything you will need to replace the BBD except the wrenches.
It is easy to install and mine purred like a kitten with NO ADJUSTMENTS.
The best price I have seen is $349.95 with free shipping at Performance Parts Warehouse.
You will be amazed at how well your 258 can idle.
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87 Wrangler, 4.2L, Weber carb., HEI, BA-10/5 (but not for long), Procomp lift, Procomp 3000's, Superwinch