By today's standards, it's going to be mild. This may be a Mo Pinel ball, I'm not sure. He was with AMF near around that time.
You had the Whip and Whip Pearl, the Bull Whip, and the Whiplash. The 'lash was the last of the series. I have a Bull Whip and it goes very long on today's oil and is very mild in the backend.
The cores in these balls were pretty advanced for their time and hold up well today, but it's going to be a light to light-medium ball, I would bet.
Jess