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I like the Pro Parts headers.They work with either 383 or 440.You can run a larger tire,don't have to pull the T-bars to install them,starter is a breeze(on 440,383 is a bit snug dropping it out)nad although they are a semi fenderwell header,they fit very well.Bob Mazzolini sells them,and the new ones are made by
TTi.

they are so much easier to work with ...Keefe

1971 duster twister 440, 3380#,509 M/P hyd,906's,full Exhaust,11.06@117.46 1/4,6.95@ 97.03 1/8,1.497 60ft.....