I'm pretty sure you don't need a mod plate for a 4AGE into an AE86 because the engine capacity hasn't changed, the engine block is still the same (just has a different head and whatnot) and the engine was actually released in the AE86 chassis.
I've seen people do the swap and then just take the car into QLD Transport and report that the engine number has changed because they swapped engines due to the old one exploding and shit lol. :lol:
A guy I know did this and it all seems legit, QLD Transport gave him a slip of paper to say that the engine swap was verified and is OK.
If I'm wrong someone please correct me