I love mine and it’s been on several different engines that ran mid 8 - to high 8 second passes but I can’t help you out about vacuum pump use because I never ran one. They are made pretty heavy duty or at least they used to be

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