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you need both
 

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Wats The Best ?
Plenty of online cam info
http://www.stockcarracing.com/techarticles/general/scrp_0608_valvetrain_myths/
http://www.popularhotrodding.com/tech/0607phr_camshaft_basics/

Bottom line is it depends on the engine application; carb or EFI ,truck or speedway engine, even the trans and axle choice
For example , on a EFI engine ,longer duration = more valve overlap @ idle which makes stock ECM not very happy; See cam LSA
http://www.compcams.com/Technical/FAQ/LSAproperties.asp
hence why you see " computer compatible" camshafts available
 
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