vacuum pump
I purchased that Aerospace kit a few years ago. The salesman was very helpful and a made suggestions as to what front and rear seal to run and how to make sure engine was sealed good to get max vacuum. Kit looked nice and fit nice. But it would not produce near enough vaccum. About 3" at idle and 6" at RPM. I tried to work with them and they suggested I adjust the end play and reshim and so on, but never made it any better. They never offered to let me return it and just kinda said "Oh Well". I have not bought anything from them since.
Moroso Vacuum pumps would be my choice.