340 max camshaft with exhaust manifolds

inertia said
The 1970 Mopar Hustle catalog listed first recommended improvement were LD340, 3310/780 Holley, and Hooker underchassis headers, - no camshaft !

Yes, enthusiasts see things differently above the 49th parallel. for instance, OEM 340 springs are a tad light for an aggressive ramp profile.