new to me 66 dart.....

To get things started, 66's came with 273's so a 318, 340,or 360 will also fit without major modifications. If you switch to a v-8 you will need engine, trans, driveshaft, and rear end. You will also need a steering center link for a v 8 along with brackets cross members and the like. A larger radiator is usually needed too. There are a lot of helpful people here that have the parts and knowledge you need. Someone is always parting out a car for you to get pieces from. Hang around and ask questions and have fun. tmm