Well I test fitted my BB air cleaner assembly on the SB this morning.nn looks like everything will work for a closed system with a 3“ filter and cover just like my 66 BB.  The other option I am looking at is a dual snorkel cover with a 66 base.  I can probably run a pcv to the oil fill tube or the drivers side valve cover And just block off the one I don’t use.  I am leaning towards the dual snorkel 

-- Edited by jim larson on Friday 17th of September 2021 05:59:43 

-- Edited by jim larson on Friday 17th of September 2021 06:08:22 

-- Edited by jim larson on Friday 17th of September 2021 06:09:37 PM

-- Edited by jim larson on Friday 17th of September 2021 06:15:51 PM

-- Edited by jim larson on Friday 17th of September 2021 06:30:29 PM

Dual snorkel would look more period correct and not have a 396 sticker on it...