I put a rollover valve on my fuel cell in the duster last year. I've heard of guys putting a fuel filter at the end of the vent line to prevent dirt from entering the cell.

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time