The hotrods give less vacuum. My car does it too. From what I've read across forums, all 3V cars with aggressive cams do it too. As soon as the engine shuts off, the brake pedal is useless. You just have to use your e-brake when the car isn't running and get used to it. It should have very little to no effect on pedal effort when the engine is running.
Bama tuned/SCT/FRPP Hotrod cams/Prothane engine mounts/Pypes longtubes/off road x pipe/Bassani Race axleback/MGW shifter/FRPP 4.10 gears/J&M lower control arms