Welcome to the forum Dan.
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Is it a standard car or already modified? Original turbo and suspension?
How many miles has it done?
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Probably worth your while doing enough miles as it is just to make sure it is reliable and identify any niggles before doing power mods.
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If it was me, I would sort out any rust before modding for power gains.
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About 10 years ago I dont remember seeing a rev 3 older than an L reg, and I have seen rev 2 on K reg so I think 93 was the change over year between rev 2 and rev 3.
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In recent years some rev 2 owners have modded the car to look like a rev 3.
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You can tell what it started out as from the chasis number.
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If you do a search you can find the Toyota chassis number range for each year.
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Have fun with your mr2