recommended cam for a 5.9 magnum?

Roller of course.....Really need more info to make an educated guess,
Intake manifold? single or dual plane advertised power sweet spot
exhaust headers/manifolds?
carb cfm, vac or mechanical secondaries?
rear end gears?
converter stall speed?
tire size?
distributor stock or aftermarket?
heads 1.92 or 2.02 bowl work or ported?
compression ratio?
power adder nitrous/turbo/supercharger?

good place to start to get a general idea go to compcams.com and download camquest6