Ring somebody that does blue slips in your area. Tell them the nature of the engine swap, and ask their advice.
This is the only way to be sure that you are getting the correct info.
If you like what he has to say, go to him. If you don't, ring someone else.
At the end of the day it matters bugger all what so and so said on the Forums, because you will still need to see someone authorised to do the inspection.