* Transmission: Automatic versus manual transmissions significantly impact acceleration. A manual transmission will usually be quicker.
* Rear Axle Ratio: Different rear axle ratios (e.g., 2.73, 3.08, 3.73) greatly affect acceleration and top speed. Higher numerical ratios mean quicker acceleration but lower top speed.
* Condition of the Vehicle: A well-maintained engine will perform better than one that's neglected. Tire condition and overall vehicle weight also play a role.
* Testing Conditions: Environmental factors (temperature, altitude, wind) can influence test results.
While precise figures are difficult to pinpoint, a reasonable estimate for a stock El Camino with a 305 and automatic transmission would be in the 10-12 second range for 0-60 mph. The quarter-mile time would likely be in the 17-19 second range. 0-100 mph times are rarely published for these vehicles and would be significantly longer than the 0-60 time.
A manual transmission would shave a second or two off both the 0-60 and quarter-mile times. A higher numerical rear axle ratio would also improve acceleration but at the cost of fuel economy and top speed.
To get a more precise answer, you'd need to find acceleration data from road tests performed on a specific El Camino with the exact specifications documented. Unfortunately, such data isn't readily available for every configuration of the vehicle.
