hi, mopar did their homework back then, concerning intake manifolds. in early days of super stock, there wasn't a aluminum manifold that worked with a340, ed hamburger , modified a stock cast intake for his super stock 340. it out performed any aluminum intake at the time. then offy came out with a manifold that worked, you had to glue pop sickle sticks in floor to get correct fuel mixtures to each port. now they went faster!!! the stock cast iron intakes on 340's are a very good intake, street or race use!!!