I covered this subject in the past. I feel it's so important I will repeat the info. The intake gets torqued into place. It's then packed with towels. Good bath towels cover the rockers and injectors. The intake has lay out dye brushed onto it. It's then sanded until it's flat. I use a large plate with handles on one side and sand paper glued to the bottom. The third pic shows the low spots after just a few passes. I vacuum the intake before I remove the rags. Aluminum studs are then screwed in. I use anti seize on both ends of the stud. A o-ring is then placed in the groove. The blower is then torqued to 30lbs. Remember the clearances in a blower are only a few thousand any distortion on the intake deck is tranfered to the blower case. A crooked case is a great way to trash a blower. If paper gaskets are blowing out between the blower and manifold it's usually due to a uneven deck surface. Or if a clicking sound is heard coming from the blower when it's running.