hello everyone, newbie here

Hello everyone, my name is frank, I own a 71 Demon /6. Love my car as this is my first Mopar I ever owned. Ive owned this car for 5 months now. Right now I'm debating wether to keep the slant 6 in or put a 318, that i just picked up? Still need to do some research to see whats all involved in making the swap. Hopefully this forum can guide me. Thanks in advance.