Please Help identifying underhood components

A Unkown to me
B unknown to me
C bulkhead connectors (source of many a failure)
D ballast resister (many say it is a failure point my 67 has 321,000 miles and never a ballast resister replacement)
E unknown to me
F Mopar electronic ignition module

I believe Rustycowell69 is correct that A is the voltage regulator, and the goop leaking from it is the pottant from the back side that covers the electronics..