360 Magnum Budget Build Recommendations?

You need to figure out the shape of the current motor first, just throwing parts at it wont really get you where you want to be. Did it run prior to being put in there? and how long has the intake been wide open like that? hopefully water didnt get in there. Does it spin by using a wrench?

And like the others have said thats not a magnum engine. So the cam that you listed is a roller cam, you would also need retro-fit roller lifters as well, and then the heads would need work for the new springs. A LA engine has a flat tappet cam and not a roller. And If its a bone stock engine you probably wont be too happy with that cam (could be wrong though) seems pretty big for a stock low compression engine, the solid roller going in my 360 doesnt even have that much duration! lol. A big cam isnt always better, a cam matched with the entire car is the funnest. Dont buy anything yet, it took me a few months to decide on the cam I wanted to run.

Whats the plan for the car? and what does it have? type of trans, rear end gears stuff like that.