Am I going to destroy my knees?

I have an old pair of Look PX race bindings mounted to an old pair of skis. The PX was designed to work with an alpine sole. I recently got gripwalk boots and do not want to remount this particular ski with GW bindings as it has been drilled many a time already.

When I put this gripwalk boot in this binding, I can still fit a business card in between the AFD and the soles, with a little friction. As I understand it, this is how you check toe height on bindings with an adjustable toe height.

if the gap appears right, even though it’s technically a gripwalk boot and an alpine binding, am I safe to use it? Or is this a dumb idea and am I going to destroy my knees?

Ski tech jabronis please advise