BB Mopar head design ??

After taking apart a few big-blocks (383 and now 440) one peculiar thing I've always noticed about these engines is the valve location and angle. Why do they sit towards the outside of the block instead of closer to the center? The factory reliefs in the chambers and some of the block decks to keep the valves unshrouded just makes me curious what was the purpose? I read an article in a recent issue of Engine Masters magazine where a company building a low-deck 466" stroker heavily modified the heads (Procomp aluminums here) to improve flow; besides lots of porting they angle-milled the sh*t out of them then relocated the head bolt holes to move the heads "upward" towards the center of the block. Maybe a 'dyno queen' motor to some but made 755 HP at 6300 rpm and 674 lb-ft at 4800 rpm.

If you're curious for details google "engine masters rram mopar" or something similar lol