Hypothetical 360 magnum build

Well I don't / won't race it, probably don't need more than 3500 rpm anyway/ but I want to make "idle to 4500" better and if I can do so with what I have collecting dust, all the better.
If I can't, or if there's some reason it absolutely won't work out, !parts are gonna "crash" or blow out the side of the block, etc. I get that. I also had the joy of building an engine years ago that was "lots of noise but less power than stock. Don't want that either. I'm not saying I don't want to or can't spend "any" money on it but what's wrong with using what I have if I can? I don't think I would be able to get pennies on the dollar of money already spent, trying to make lemonade out of lemons. But I want it to be an improvement over stock, at the same time
I'm looking at having to buy a set of heads most likely at any rate, and with all the talk of aluminum heads I'm considering that. But I want to work with what I have at the moment and that's short block parts.
Let’s start over.
What is this engine going into? The Durango?

Is it going to be running factory fuel injection manifold and serpentine drive from a Magnum 360?

Can the EQ heads that were previously damaged be fixed?

Edit: This site glitched and I lost half of what I typed. We’ll just start with those questions.