magnum manifolds/340 manifolds

ok still trying to decide on exhaust options for 71 swinger with 318 auto. cant decide between headers or exhaust manifolds, Ive ran across some 360 manifolds and also some 340 manifolds, the 340 manifold casting #'s ck out but they have heat risers. I have not visually seen the 360's in order to ck the #'s on those, any way what numbers should I look for to be the best 340 or 360 and also magnum manifolds from the 90's? which magnum manifolds from the 90's will work on the dart. I may end up using long tubes but cant afford nor do I want to put big bucks in doug's or tti's so i'll probably use hookers if that route is chosen has anyone had any luck out of the hookers as far as fitment etc the hooker part number is 5901hkr I have power steering. rustyratrod suggested shorty headers and I don't mind using them but im unsure of how well the fit concerning where they seem to dump in the middle on both sides (at least the ones ive seen pics of) not sure how well the headpipes will clear on those. the engine is a stock 318 at the moment but will be refreshed with cam upgrade etc fairly soon. have edelbrock carb and performer intake on it now. the exhaust on it now is awful this is why im fixing it now as opposed to waiting until the engine build. I have researched and read and read and then read some more just looking for input, ideas and advice on the casting numbers from obviously experienced A body guys. thanks fella's