A couple of the basic advantages are the camshaft is usually made from a much stronger material(billet) to avoid flex and doesn't have any variations between the lobes like a lot of off the shelf units......I feel they are more of an advantage when trying to tie together alot of aftermarket parts or to try to achieve a specific goal whether its power or driveability or a little of both...Of course it is also nice to know you have the correct cam specs for your exact combination no matter how mild or wild..

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1968 mustang..408 windsor.Vic jr heads and intake.Pro Systems 950HP holley, 1 3/4 hooker super comps,Custom CI solid roller camshaft,Probe shaft rockers, 4 speed with 4:11 detroit locker.