Low Vacuum from crate 360

Got the car back and it runs great and the brakes work great. The low vacuum ended up being a leak in the base plate and linkage of the carb. We went ahead and changed the carb to a 670 Holley with primary and secondary metering blocks. The original carb was a 750 Holley that was too big for the crate 360 and it only had primary metering and no secondary metering. We also changed out the power brake booster from a single 7" to a dual 8" diaphragm. The vacuum is up to 16" and the brakes work great.