It's probably tuned for fuel economy.
Somewhere, long ago there was an article about the Valiant hoodline also necessitated the 30 degree slant. But I don't recall where I read that. It may have been at one of the WPC seminars at one of the Detroit meets years ago. I'm not sure about more room for the distributor, it was a pia to change points on if you had big hands and such, because of the motor slanting towards the side where the distributor was. At least on A bodies.Because most car and SUV buyers don't want an engine that intrudes into the cabin, or a long hood.
There are solutions. The staggered cylinder bores is one, and the Hurricane’s block is another, with even the cylinder sleeves taken out. The slant six was borne of the need to cut length; the slant made room for the (now obsolete) distributor and such. (I'm pretty sure it wasn't a height issue, Willem Weertman made it clear they'd only had room for a four cylinder. FOrtunately slanting the new straight six engine, by allowing for side-mounted distributor and such, was about that length.)
That never changed. Putting a new distributor cap on a Magnum truck engine wasn't fun either.If you had an original Hemi, pulling the distributor was almost the only option.
1). It was in the middle back of the engine.
2). It had dual points.
3). It only went back in either correctly or 180 degrees off. The bolt to retain was a little under the body so an offset angle wrench was best.
Whoever designed/approved the design, was thinking very well.