4.10's are available in the axles as stock, so if that's the ratio you want, get one that has it already. I'm hoping to order mine next week. I've been watching their prices for a few months and they've come down to ~$200 locally WITH 4.10's. They were (and still are from some places) $300+, so if it's in good shape you've got a fair deal.
As for brackets and tabs, your local 4x4 shop should be able to supply them for you. My local guys are about $7 per shock tab (need 4 per axle) and $15-20 per spring mount (need 2). Be aware that the axle tubes are bigger on the 8.8 and will drop the back end of the Jeep 5/8". To maintain the same height, you should look at buying longer shackles.
Also, please read all you can on mounting the 8.8. Specific attention must be made to the pinion angle. If you're not running a SYE, you will need to measure your driveline and match the transfer output to the pinion angles, or you'll get vibrations. If you have a slip-yolk eliminator, you just point the pinion directly at the transfer case output.
'91 Frankenheep YJ. 4.0, 4" BDS, Richmond 8.8, Titan 12k, 35" KM2's, rust.
'88 YJ, 4.2/4.0 head, +4˝" & shackles, BFG 33's (sold)