help 1964 Slant 6 tune ups specs

slantsixdan said

Tune-up parts and technique suggestions in this thread. Carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted here for free download. Get the three books described in this thread as quickly as possible.

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I see 2 different listings for the NGK spark plugs per Slant6Dan's link.

One is NGK 3459 and the other is NGK 7917, both of these refer to NGK # ZFR5N, per the link. Can anyone out there help me choose the correct one for street driving, and is there a difference? These both come up in the Rock auto part search mode, for ZFR5N.