How much will it cost parts and labor to replace a 1999 Toyota Corolla engine?

A rebuilt 1.8 Liter 1 ZZ FE will run about $1500, and is every bit as good as new. A decent mechanic can change engines in less than one day, so 8 hours (they will charge you that even if it takes less time, which it probably will. A SLOW mechanic can do it in a day.. ) so $1500 + 8 hrs @ $60= $1980. This figure can vary quite a bit depending on if you get an entire long-block, mechanics rates, and several factors but it will be somewhere in there, the $2k range.