Jeepsr4ever.... I'm thinking thin wall SS exhaust tube formed at the bottom... the top will be cut and welded and then milled flat. I'm thinking 3/8" plate for the plenum because I can always toss on an aluminum spacer. The flanges will be cut out of 3/8" plate as well. The valley pan should be interesting... I'll have to fit everything up first before I decide how I want to do that... Also, with these long runners I am thinking about welding in some bosses for fuel injection just incase I decide to go that route in the future 😉...
Old Rugged Crosser.... This will be for the AMC V8's (72-91)... I'm still debating whether or not to have the center bolt holes cut so that the early heads will work with it...