I am swapping from a cast iron intake to an Edelbrock performer intake on my 76 Dodge Travco. I did this once before on another one but can't remember. Do I just use a new valley pan only or use the additional intake gaskets that appear to go on inside and outside of the valley pan at the intake ports ? I have both here just don't remember. I would like to block the heat riser from the intake side of heads as I have had issues of the gas boiling which is why I am doing the swap. It solved this problem on my last Travco. Thanks.