Carter 59%
Reagan 36%
Reagan ended up crushing Carter in November 980
Reagan 44 states
Carter 6 states + DC.
You'll probably find the Pdf of the poll on the Harris site.
November 1980
That was in January 1980. That was like the Reagan-Mondale early 1983 poll situation in reverse, because the economy was starting to rapidly deteriorate in early 1980. Also the disaster of the failed attempt to free the Iranian hostages hadn’t happened yet. They were still in captivity on election day 1980.