M1 intake and serpentine accessories
M1 dual plane for magnum has not been available new for a while, and the crosswind has been out of stock for quite some time too. There is a used M1 dual plane for sale on this site, and he has good pictures showing its for magnum heads, but intended for LA front accessories and thermostat. If you are keeping factory fuel injection and serpentine setup, get the Hughes dual plane. If you are going with a carburetor setup and mechanical fuel pump, go with Edelbrock RPM air gap and use March pulleys for a serpentine setup. As long as you have an electric fuel pump, you can use the factory Magnum timing cover and serpentine setups. Any way you go, there is some exceptions to each combination that can be sorted out without too much trouble.