This thing is driving me crazy. Decided to change air cleaner, wanted to clean/adj distrib anyway. A bit of a struggle to pull the boot off and back the breather box out. Checked the pcv valve; it has been updated & looks clean. BUT - reassembling this thing is freaking HARD. Velocity stacks in the way, engaging the boot with the lip on the breather box is impossible, but it won't fit if I preassemble it. I MUST be doing something wrong - any ideas? I searched the archives, no luck. Are the velocity stacks necessary? Sure would appreciate some advice. Thanks in advance. David