I think it was more of a general question about the ‘68 S/S cars. They were not street cars so IMO they weren’t necessary. They likely were not hot lapping like bracket racers either.
Though it wouldn’t have been much, an extra cooler would have added some amount of weight to an already heavy front end.
If the guys who developed the ‘68 cars thought an external cooler was needed they would have come equipped with them.
