Spark Plug Recommendations? 1973 Dodge 318

[Frank M]

I changed the spark plugs in my 73 Brave D20 with a Dodge 318 a few years back. The first time I bought plugs I just went by the year and engine size. The plugs I was sold had a skinny long base and were to small for the holes in the head. I took one of the old plugs back with me (Champion RF10C) they have a large short thread. They crossed them to Autolite 127's. They fit well and the engine has been running fine but now I am curious if the old plugs were correct to begin with. Anybody know what plugs are recommended? 

[Moondowg]

Champion 3405  according to Napa They list several for you Brave Try (Napa On Line).

[Moondowg]

Whoops looked up a 1971 yours is a 1973 Try Champion CHA 405 You still should check Napa on Line.