That's what they routinely sell for on e-bay for starters. The 396, 402, and 454 360HP engines use an oval port cast iron intake. The rectangular port 569's were used on the high HP engines and there aren't as many around. Some date codes are more desireable than others as well. Sometime late in 70 they started casting them with the cylinder numbers on the runners and you usually see those sell for a little less as they were pretty much used for 71 applications.Mike, why that much?
Heres the applications :
3963569 ,396/402/454 ,70-71 ,Holley ,Rectangular port Aluminum Low rise L-78/L-89/LS-6
Depending on it's condition and date code, if it's known, and desireable anywhere from 325.- 500. If it's had no repairs, all thread holes good, clean and a good date code, it could be worth 500.