Some of the above will depend on the workshop providing the safety certificate. THere is a lot of variability between workshops that issue safety certificates and mod plates ... not to mention officious Qld Transport staff.
As as rule: a change in the induction method (e.g. from carbi to EFI) requires a mod plate so putting a 2T-GE into a TA22 should include a mod plate but not if it's the 2T-G.
Another rule of thumb: you need to bring emissions control up to the year of the donor car (hence anything EFI needs a CAT and should have a charcoal canister for fuel vapour control, etc.).
A strict interpretation of Qld Tpt's guidelines suggests that you need a mod plate to convert a manual to an auto... but i've not known anyone to bother for a gearbox change.
Also - mod or blue plates are Qld specific. Other states require engineers reports, inspections, etc.
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