Do you have power steering? Early 340 manifolds are the best iron you can get for that combo, need to be ground a bit for power steering. Spitfires will fit and are cheap if you can get them. Schumaker and Dougs makes no cut headers now as well as TTI, of course there is the semi fender Hooker's and my Hedmans which are full blown, full fenderwell race headers which are for sale by the way ;-)