Building a SBC 350 for my boat. Everything is machined and ready to put together. I have a 1990 block and putting on Vortex heads w an aluminum intake (carbureted). I'm assuming I go with the '90 intake gasket set w the 2 separate rubber gaskets for front and back of the motor is that correct?.Parts guy keeps trying to tell me I don't need the 2 rubber pieces. Might have thrown him off mentioning the vortex part when asking for the valve cover gaskets 🤷. TIA