Have you ever torn apart an all-original car to build what you wanted?

Bought my 66 cause I needed a car had a 340/727 in it. Come to find it’s a 170 W/273-4bb 4 speed car and I have the original drivetrain. Since it ls slightly rare I’m not doing any non reversible mods. But now it’s a Hellcat 4-speed with mini tubs and lots of chassis stiffing