What cam to use in a 318

Dan the man said

For a street / cruiser, in my opinion a cam with a duration of 204* / 214* at 0.050 " is a good choice. Good dual exhaust, curve kit and 3.23 gears would be good

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On an otherwise stock spec engine, definately so. An acceptable step up would be 214°/224° @ 0.050". With that another upgrade would be rockers with .1 more ratio, especially on the intake. An appropriate 4V manifold with 650 carb and headers to make it all come together.
Exhaust a bit over 220° is not much of a problem but on the intake it does start to show up.