Thanks Guys! It is my understanding that there never was a factory 4-bbl intake for a 352. The 4-bbl intake I'm looking at supposedly came off of a 390 passenger car like Bill suggests. I still would like to know what the stock cast iron "S-code" 4-bbl intake is really worth. Is there any performance difference between an "S-code" 4-bbl intake and a "non-S-code" 4-bbl intake?

Thanks,
Dan M.