Design the perfect fighter for the 1960s

Okay we all know the Vietnam air war and its influence on later fighter design.

What if you were to go back in time with the benefit of hindsight and design the ideal fighter for the 1960s. But you had to work with technology available at the time. Make it the premier fighter for decades to come and still useful today. What would your proposal look like?

I think it would be hard to beat something along the lines of the IAI Kfir. Maybe with better pilot visibility.