I had an adjustable one one one of my pumps that I picked up

794B6738-CDDE-4C6B-886C-4AA8904F5277.jpeg

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