Re: Diesel engine install
Don't put it in gear if you plan to run it on land, if you have a cutlass bearing you will ruin it. Of course if you plan to run it for a while you'll need to hook up water to the engine.
A check of the alignment will be needed about a week or two after launch as the boat will settle into its normal "shape". If you have not done an alignment before, it would be wise to have a trained mechanic look it over, otherwise you may end up spending $$$ down the road when the drive system or a component(s) of fails.
You'll want to check the RPM vs. the Tach as well, usually off and needs adjustment. Check operating temp vs the gauge as well, using a infrared therm should be fine.