Need Info on slant 6 to V8 swap

I have a similar question. I’m not really a car expert but I’m learning more and more every day. Anyway my question:

I have a 1972 dart that had a slant six, I was given the car by my sister after she didn’t change the oil and the engine blew up. The slant six was takin out later on along with the tranny and the driveshaft. I have a 360 small block that I want to put in it, I think that dart has the small 7 1/4 rear end in it. I’m trying to get together everything I need. 1973 Dodge Dart

http://www.ksl.com/auto/listing/5754004


I’m thinking about getting this 73 dart with a 318, it should have the bigger rear end I need and a v-8 k member as well as the drive shaft I’m hoping it has a 727 in it. Any suggestions or what else do I need that this 73 wouldn’t have ? Also buying that dart should save me alot of money in parts right ?