summit headers

i was gonna order some headers for my scamp. i looked on summit and there are summit ones for like 100 bucks and hedmans and hookers for like 150. i was gonna go hedman cuz they supposedly dont hang as low but would summit be ok? http://www.summitracing.com/search/.../Make/DODGE/Model/DART/Year/1975/?Ns=Rank|Asc

i was also thinking about some leaf springs as mine sag to much. they offer mopar perf ones for 109 a piece. i think those would be the ones with one side higher for traction? if so is it really noticeable? or could i order 2 right side ones? http://www.summitracing.com/search/?keyword=dcc-4120864&dds=1 http://www.summitracing.com/search/?keyword=dcc-4120863&dds=1

there is a 10% off coupon on here that i was gonna use so thats why i was thinking stay summit but who knows lol. one last q if i want to relocate the springs what all do i need? they have a kit for it with front hangers, shackles, rear shackle mounts, and spring mounting pads. couldnt i just buy some pads to put on the diff and build the rest except shackles which i could reuse? thanks tyler