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try the library and get a chiltons repair manual for your year valiant.
Try manciniracing.com.
any auto parts store will have them or can get them for you.
Answers.com made a valiant effort to find a proper answer to the question; "what is the spark plug gap for a Plymouth Valiant?" an early economy car built in America; but named after a heroic comic character from England of King Arthur fame; named Prince Valiant.
THE WIRING OF THE 74 DUSTER SHOULD BE THE SAME AS THE VALIANT AND DART MAYBE EXCEPT FOR YOUR NEUTRAL SAFETY SWITCH FOR WIRING DIAGRAMS: http://www.mymopar.com/downloads/1974/74ValiantA.jpg http://www.mymopar.com/downloads/1974/74ValiantB.jpg http://www.mymopar.com/downloads/1974/74DartA.jpg http://www.mymopar.com/downloads/1974/74DartB.jpg FOR ANY OTHER QEUSTIONS ON ANYTHING MOPAR TRY: WWW.MYMOPAR.COM
you find it in the tunk with the bodysd in 1965 Valiant Signet.
Mounted on the side of the engine block. Follow the fuel lines and you will find it.
Go to the library and get a chiltons repair manual for your year car.
he's dead and you find him at the end
try craigslist, E-bay, or maybe mancini racing.com might have it.
The fuses are listed on the cover of the fuse box. If you need a schematic or wiring diagram you will probably have to buy a service/repair manual.
The STX38 fuses are easy to find on a tractor. The fuses are located under the hood.