12 feet is heaps it creates a entire different immersion racing close especially in old cars with not so good brakes and grip. I agree for modern GT and other stuff a Modern version of course. If you drive revived 1960s at any Modern Track with similar layout I guessing you need to rework your racing lines at least even setup.
And that pace car, boy, wouldn't we all want to drive that? Not sure how often or bad race start incidents were back then, but by today's standards, you would needs some really big attachments to drive it in front a field of those cars. "Just pull up against the wall, you'll be fine."