Yes I have, but... in the case of these cars, the chassis aren't great but they're already on hand and were made to fit these bodies. Since I'm building two at once I'm choosing my battles.
As I've done with other projects like my '65 Nova, '64 Caddy and '61 Comet, it's been a fun challenge to improve/dress up the kit chassis since those were pretty good to begin with. I do have '64 Plymouth, '65 Comet, '58 Edsel and '60 Ford chassis stashed for future projects, and the '59 DeSoto will get '57 Chrysler underpinnings since they're a great fit.