You'd be running either the 200 or 212mm dia flywheel.
It is impossible to tell from the outside.
Yes, a lightweight flywheel such as TRD or Jun or something will give you snappier acceleration for the track.
If you search here and on Club4AG you will find all you need to know. (except for the size of your flywheel)
I think you will find all the earlier flywheels for 4age up until sometime in the smallport era are 200mm. Since then they are all 212. You cannot use a 4agze wheel. You will find that the 7afe flywheels are the same as the later 4age ones.
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