Howard Cunningham's Desoto, the challenge of Richie trying to pick up girls and look cool, was finally solved when Richie got a cool Ford

But it did win a drag race (after Fonz hopped it up with heads and carbs)  when Marsha from the Brady Bunch guest starred as a girl who would date the winner

the Happy Days Desoto is now in the LeMay museum!

thanks to Dave Dunn for letting me know where it is now!