Spark plugs

["Jack W. Drews" <vinttr4@geneseo.net>]

I'm helping a friend get his 1950 Riley running properly. For his style
of driving (church on Sunday, all in-town) I think we need hotter plugs
in it. It currently has Champ L10S and they carbon up pretty quickly.

I have searched the web for spark plug interchange charts but have been
unable to find anything other than Edelbrock's racing plug chart. Anyone
know of a chart like this on the web?

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TR6 -- 29 and still running
TR4 -- 39 and still racing
uncle jack -- 59+ and still_________(fill in blank)