* 300 cubic inch inline-six: This was a very popular and durable workhorse engine.
* 351 cubic inch Windsor V8: A common choice for more power. This was available in several variations, possibly including a 2bbl or 4bbl carburetor depending on the model.
* 400 cubic inch Cleveland V8: Offered more power still, but less fuel-efficient than the smaller V8.
It's important to note that there might have been other, less common engines available, depending on specific options and regional variations. To know for sure what engine *a specific* 1978 F-100 had, you'd need to check the vehicle's documentation (like the owner's manual or the vehicle identification number (VIN) decode).
