Getting ready to swap a 5.7 into my 73 Dart Swinger

Thanks a lot for the info! I'm quickly realizing that there were a little more smoke and mirrors involved this swap than what I had anticipated lol. I am still set to start on this in about 3 weeks though. What about a driveline? Someone said earlier that you have to use a custom driveline? I still have mine and I have the one from the donor car. I was hoping one of these would work somehow.
The small block transmission will bolt up to the hemi. There will be one bolt hole that is not used (the top if I remember correctly.) You will need to dig through the posts here to see what you need as far a flex plate and such as I do not remember since I am not using the mopar tranny. The rear end will hold up for bit if it is a 7 1/4 but no telling for how long. 8.25 or 8 3/4 will hold up fine.