The "long and honest" answer is that no matter how you look at it, there are some processes best not subcontracted.
Final clean of the block is one, trial assemblies are another. A few notes:
People talk about scrubbing the bores with warm water and a pure detergent after honing to get all the grit out. This is pretty important, and rinse with scalding hot water as it'll carry away more residue. Soon as you do this, the bores will rust; it happens in front of your eyes. Don't panic; the corrosion is microns thick. Now pour some oil onto your clean hand and liberally smear the bores to put a visible film on them. The corrosion marks will turn grey-black and are now OK.
That said, your basic order for the final clean is: water jackets, then pressurised oilways, then return oilways, then bores. Up to this point I'd leave the oily smudging from a hone, on the bores. Clean the motor facing upside down first, then on each side, and finish the right way up.
Use compressed air and a "prodder" in your water passages, then solvent and a brush (I prefer wax and grease remover) in oilways and oily areas - finished by blowing dry with air as you work.
This is an excellent time to follow the oil passages around; make sure you understand exactly what's going on, and can see all junk is removed.
With your trial fit for deck height, no piston rings are needed - makes the job easier. Plus you only need 20-odd foot pounds on all bearing caps. Don't confuse the order of any main or rod caps, or get them rotated 180°! Note the bearing shell backs must be dry - you only put a splodge of cam lube or similar on the wearing face. When pushing the shells into place, watch for fine shavings of metal getting produced.
That said, you also have to clean the crank, as grinding residue will be left in its oilways. Immediately after cleaning, hand-wipe oil onto the oil seal running surfaces at both ends.
That's pretty much all you need to do in preparation for trial assembly and deck measurement. It'll take eight to ten hours, though, if you're not used to it or in a good workshop. Be aware that some of the cleaning will need doing again for final assembly, as there will be a time period over which stuff sits...
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