Internet tells me 64-70. 4 green rings and a "Star" center electrode. so...maybe?

North wrote:

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I know that US Pontiac's switched to the "N" shaped plugs midway through the 71 model year.

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 huh?

Heat ranges aside, USA-Pontiacs used R45S as the standard plug for 1969 through to 1971.
They swapped to the R45TS for 1972

I only ran across these "N" plugs a short while ago, but so far I have only observed ones which would be comparable to the "T" or "TS" plugs.

My June 1993 Delco spark plug catalog does not list a R44N for any 1969 Chevrolet;
The closest I can find is a 1968 Chevelle  that lists a 44N or 44XLS for the 396 265hp/325hp engines.
(My catalog is a USA printing, so not Canadian Poncho's are listed).