I don't know of any cars in the 80s and 90s that sealed the hood-bumper cover gap; cars as late as my 2005 Civic didn't have any weatherstripping there. Today, nearly every car that's more expensive than a Mirage has some. From the lowly C-HR:
(weatherstripped all the way around, actually)
...and Civic:
...to Chargers:
...and BMWs:
