One or two fuel lines?
# of spring leaves was not dependent on the model, but the options.
From the site:
Generally, Z28's used 4 leaf springs and the other multi-leaf spring applications used 5 leaf springs. However, contrary to popular belief, the use of 4-leaf springs only on 68-69 Z28 cars and 5-leaf springs only on SS, L30/M20, LM1, L65, and COPO cars was not fixed. Spring sizing was assigned as a function of weight and option - and this was especially fine-tuned in 1969. Z28s with five-leaf springs and SS, L30/M20, LM1, L65, and COPO cars with 4-leaf springs are possible according to factory documentation and they have been observed (Z28, SS, L30/M20) on original cars. We have not yet observed a COPO, LM1, or L65 car with 4-leaf springs, but believe it to be a possible outcome, depending on ordering options.