More Magnum Block Oiling Questions

some early blocks do or you can drill, there are fixtures available and perhaps the forum members know who owns them
however feeding the shafts from the ends from the back of the block works
I also suggest through the pushrod oiling be kept for the pushrod/ rocker socket

I would doubt it off the shelf but that core should be available or any could be drilled, contact your camgrinder of choice
several core choices- fuel pump lobe, short vs long etc
3 yes