Magnum 5.2 into early A?

Going through the same thing with a 65 Barracuda with a 273 with 318 heads. I think alot of it depends if it has power steering. Mine does and the only thing that will work are doug's headers, spitfires, early 273 manifolds (what I am using). I tried 340 manifolds and 71 318 manifolds and had no luck. I have also heard that magnums won't work with power steering either. They all hit the power steering box.

I'm not sure about the timing cover. Sorry