Spitfire headers

Just wondering if anyone has used spitfire headers in a 72 dart with power steering and with fullsize starter. The car is a 4 speed. Any clearance issues?, Where do they dump out at?. Right now I have stock restrictive original stock manifolds. Will I see a power gain?, I am running 318 stock bore, 302 heads mild P&P, Eddy performer intake, Eddy performer cam (420 lift). I have a 2 1/2 inch TTI exhaust with H-pipe from the manifolds back and wondering if the spitfires would give me a little more HP.
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