I have only seen pictures of the GMC's and the hinged hood and fender sections. I could assume that they made accommodations for several engine options. The Chevrolet LCF had only 2 options, the small block 265/283 or a 326/327 Olds or Pontiac.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy