Comp XE275HL Idle Vacuum

Rhoades lifter will get you a few inches at best as mentioned..... Been down this road too many times with normally aspirated and boost applications. Hydroboost will give you the pedal you are looking for. There is always a trade off with anything but it is a good option.

I personally like to see a minumum of 15" for vacuum boosters but mileage and opinions will vary....

JW