Ignition is set under load and a few BHP can be found by giving some advance but obvs det is needed ti listen for which is part of it. Also boost fuel is checked and adjusted. Me i check the sensor resistances and feeds. Also things like a smoke check and plugs like you said and compression. Then setting the TPS. Turbo is checked fir play etc. Just a mixed bag but depends where you go. Alot wont touch mfi. Other places will just strap it down and do a power run or others say it needs efi etc. All comes down to what you want and what you need