To put it as simply as possible, the 1JZ is superior in every way: power out of the box, power potential on stock internals, aftermarket parts availability. The effort required to wire up the stock engine management system is roughly equal for both. The only real downside with the 1JZ is its size and weight; it's quite a bit bigger than a 1G and will be a tight squeeze in an early Corolla. If it's a non-registered race car though this isn't a big deal, get the grinder out and make room as required!
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