First Motor Swap ever

Question: What year car, and what year for the "new" engine? There were some differences in the engines in the early years, that have to be considered when swaping. The biggest issue is trying to install a 67 or older engine in a 68 or newer car. The crank "pocket' is smaller then the pilot on the torque converter, and will not fit. There are differences in oil pans and engine brackets (different years and body styles) but these can be swapped from the removed engine.