Now that is the million dollar question because it is a huge and wide variable tha depends on parts purchased, skill level involved as in how much you do yourself vs. having someone do it.
This is also why I went through the trouble of going to Summit racing and looking up those parts to copy and paste in the post so you can see the prices involved with those parts or other one you may like over the listed ones.
Oh! I did forget you’ll need a car oil pan and pick up since almost all Magnum engines are from a truck with the wrong pan for use in cars.
Your going to have to figure it all out yourself.
We have pointed you in the direction and turned on the light. Now it is up to you to figure out what it is you want, what the whole thing will need parts wise and then start in on it.