I'm using the Fel-pro gasket kit to reinstall, have a couple questions as there's nothing in the pack as far as instructions.

When I removed it, there were four small metal sleeves, two in the uppermost holes and two in the bottom ones. The kit only provides two plastic ones. Should the go in the uppers or the lowers, and should they go into the block or into the back of the cover? They're shaped like little top-hats, with a brim.

Also, not a question but an observation- the two holes that are waist level in the cover slip over two studs mounted in the block, so you hang the cover, then fasten it, as opposed to using all bolts and trying to support it until it's fastened. Is this standard, or something the previous owner changed?

Other than that, pretty clear. The crank snout seal has been changed, sleeve is on the balancer (yes, there was a small groove, I think it was Dr. Drivability recommended getting this kit for that reason). Need to get it back together and see if it starts pumping gas.