From 6 to 8 syl in `66 Dart - tips?

brakes are not a huge deal, you can upgrade to disc later, if you take it easy they will do just fine

steering will handle the v8 just fine also, but you may want to upgrade the torsion bars adventually

engine, well you will want to go with an oil pan for a later model A body that was factory 360 as the pan is different from a 318, as well is the driverside engine mount and the torque converter

steering link will have to be changed

the rest is simple