I've obtained an original rear vent style engine Valley Cover, with the intent of a PCV conversion. After cleaning it up & drilling out the downdraft tube attachment, I noticed that the  baffle box is somewhat shallow. When I loosely trial fitted a common PCV valve I had on hand, it bottomed out in the box, at the outlet. Does the baffle box need to be modified for clearance & or oil control ?. I went to J. Mummerts site & looked at his rear vent unit  that he sells & the baffle box appears to have a small extension on the bottom of it it, possibly for clearance or oil control? If I recall vaguely, some time back, someone recommended a PCV valve for a model of SBF 289 possibly, but what model # or year ? Then there's the hole grommet needed, which is quite large at about 1-1/4" in diameter. Is there one readily available that fits without mods?. Any info appreciated, thanks         


Paul