Magnum vs LA block...differences...preferences

Some questions I have are which (LA vs. Magnum) has the better rocker gear?
What is better for higher rpm and longevity, pushrod or head oiling?
What head (LA or Mag)?
Is one head/intake bolt configuration better (I hear valvecovers seal better on Mags)?
Mag heads/intake or LA heads/intake?
I think the LA rocker gear is better with the bar system.
Oiling the rockers ether way is fine. The shaft has a longer path which is not a longevity issue or problem.

The LA system for higher RPM. The Magnum gear will need a little help with high lift cams. A “Girdle “ like the. Chevy uses is needed.

LA or Magn head? I would go the LA route for the above bar shaft for rockers and larger selection of intake manifolds. Thanks n head bolt configuration, the Magnum installs easier. That’s it.

Valve cover sealing. The Magnum has a waste in better sealing simply due to more hood down points around the valve cover. Why this would matter to yourself only implies you don’t know how to seal a gasket.

LMAO! We know that’s not true.
We know proper pedal and even a half as quality gasket will seal. I like the Mr. Gasket (IIRC) that MP used. Rubber surrounding metal. I’ve used cheap cheap auto tire gaskets, expensive gaskets, niche company’s gaskets, Edelbrock gaskets. They all seal the same if properly done.