It's the end of the season and everybody is busy with winter preps and last minute fishing runs. I had some thoughts for you but I was waiting for the "big boys" to jump in. Don't worry, someone will be with you soon.
In the meantime, I would just go with logic and say that engine position with proper cavitation plate and prop depth is the main concern with mounting up a replacement outboard. Since you've done this before, you probably know more than me about that.
As always, you will want to check, if not change, the oil and filter as well as the gear case lube. The same goes for the fuel system. I would want to know EXACTLY what the inside of the VST looks like and that the water separator filter is fresh and the fuel lines are free of water.
And I would pull the plugs and check their condition and do a compression check. Actually I would have done that before purchase but I know that if you're getting a "killer" deal, you just want to buy and get the hay out of there with your new motor.
If possible, set the lower end into a tank of water and observe if any oil leaks out of the gearcase. If so, you will want to address that before using the outboard.
open the hood and inspect the crankcase vent and for possible critter nests if the motor has been laid up for a while. Same goes for the air intake muffler duct, and electronic control cover. You don't need to digest a wasp or bird nest on initial crank up.
You can use a small mirror to gain a vantage in there without pulling major assemblies off.
Mouse turds are also a tip off to check for chewed up paper or cloth and chewed wiring under the hood that could start a fire or a short. Mice can get into some tight places when they want to.
Pump up the "low pressure" side of the fuel system and check for any weeping fuel line connections or outright leaks.
This is an internally balanced engine with chain and sprocket cam timing. The chains stretch and the chain guides and tensioners wear as the engine is used but with only 156 hours, I would not suspect any of that to be an issue.
This outboard does have numerous water hoses and I would carefully check the routing of those for any chafing or rubbing that could cause a hose to fail. Also, check for any rust on the hose clamps as being a sign of a leak.
Hopefully others with actual experience with this outboard will respond. I hope you enjoy owning your new to you Honda.