The Ferrari 553 was raced in the 1953 and 1954 seasons. It wasn't particularly successful, but it won the Spanish Grand Prix at the end of the 1954 season. It was very pretty, though. It was nicknamed "Supersqualo" (super shark) because of it's widened, rounded body shape.
BONUS: The car is pictured with show wheels and tires, not legal for racing. Models are included for the show wheels and tires, in case you'd like to use them. (The larger tires obviously are intended for the rear.)
What is a "pinewood derby car shell"?
A pinewood derby is an event created by the Boy Scouts many years ago. Each scout is given a pinewood derby kit typically consisting of a block of wood with slots for axles, 4 wheels, and 4 nails to be used as axles. The scout (and his dad, usually) will then carve the block of wood into the shape of a car, paint it and apply stickers, install the wheels on the axles, and then race it at the "derby", which involves a sloped track with a timekeeping apparatus.
An official scout derby will usually require that the parts in the kit be used for cars entered in the derby. Other organizations (including workplaces) often hold derbies, too, and some of them require the use of the parts in the box, including the block of wood.
These "pinewood derby car shells" are intended to be used with an official derby wood block, cut down to size, along with the axles and wheels included in the kit. A printable model of the shaped wood block is provided. You can either use the printed model or use it to accurately cut an official wood block down to size.
Notes:
Smoothing
Previous cars that I have posted were printed on my FlashForge Adventurer 3 and required smoothing. My Bambu Lab P1S prints more accurately and the slicer (Bambu Studio) has adaptive layer height, which means that the surface is smooth enough to paint without smoothing.
If your printer produces a rougher surface, you can smooth it with 3d printing resin and baby powder. You can find videos and guides online that describe the process, but here it is in a nutshell:
You can add tungsten weights to the hole in the rear of the body. If you plan well, and use enough infill, you can maximize the weights and end up right at 5 oz.