Corvette Summer (1978) - starring Mark Hamill and Annie Potts.
He returns the car to his old high school and gets the girl.
Not my fave movie and I didn't expect it to be (my taste in cars = old volvo station wagons), but I'm taking this summer-themed movie series very seriously, guys. Very seriously. This fit.
See all the previous movie posts here.
For more summer fun click on the "summer movie series" tag below.