As to what kind of course you would be playing, just go play a Dye or RTJ course built in the same year.
As to fee variations, Jones would have been higher in fee than Maples, I am pretty sure. By that time, the ASGCA and other professional "standard minimum fee" charts were under attack or outlawed and competition lowered fees among the regional architects. I seemingly recall Jones charged 10%. I know others from that era that charged 6-7% of anticipated construction costs. I don't know what Dye might have charged a year after Harbor Town opened up to such great acclaim, but I bet he would be less than Jones and more than Maples at that point.
I doubt the hiring process has changed significantly. Some just call the big names. Some call local. Some call ASGCA or the NGF for a list of names. And some just happen to know a gca and they get hired without any competiton.
Of course, 1970 and 1971 were particularly signficant years when it came to who designed your course. With the end of private passenger trains and the formation of Amtrak, it was much less likely that HH Barker or others would be passing through your town on the way to somewhere. We all know that when he passed any particular town, like Philly, that it was a guarantee that he designed courses there.........
