AE101 5Speed Manual 4AFE can consider an ultra reliable bullet proof car. Hardly have any trouble and show stopper apart from aged wear and tear.

If you wanted to get one, get a cheaper then send for engine and gearbox rebuild no matter its 4AFE or 4AGE or 3SGE or what ever engine is in there. After doing a full rebuild which isn't cost much for a 4AFE if you already getting the car at low price then it will be able to service you probably for another 5-10years depending on driving style and maintenance habit.

Even you thinking to transplant better rebuild the internal before transplant coz most of them already aged more than or about 10 years.