273 swap to 318/ build, cost, potential, daily driver

I understand N.D. countryside is not highly populated!but maybe you are in a city. Try to meet some local Mopar guys and put the word out you are in search of a "fill in the blank" good running stock Mopar engine. Network!!!! It has worked for decades in our hobby. That is the path of less $$$. Find (make) a friend with a car he can take you for a ride in and see if it's drivetrain is something you want.