Those are without a doubt Diamond heads. The end of them is a dead give away.

ALL Battens have freeze/core plugs in the ends of them, Rectangle, oval, does not matter. They made them in both port configurations....

Yes the aluminum is soft & porous... Heli coil in all bolt holes would not be a bad idea & use anti-seize on any that you don't have helicoiled including spark plugs.

RAM is probably an old Bill Richardson stamping.