360 HP Confusion. History of this motor?

I did some research, this is not what I believe necessarily

Windage tray
Oil mods
Chrome caps in valve stems
Undersize special exhaust valves
Special intake valve
Special valve springs
Hemi style rocker arms
Double roller chain
Special carb
Special distributor
W2 heads
6 qt pan
68 340 cam
72 340 smog cam

Etc etc etc

WTF, is there an authority here ???