1971 Dodge Dart 318/904 trans ***CAMSHAFT OPTIONS***

1971 Dodge Dart 318/904 trans ***CAMSHAFT OPTIONS***

Small Block Chrysler 318-360ci

Lift: .420''/.420''

Duration @ .050: 204°/204°

Advertised Duration: 270°/270°

Idle-5500 RPM Range

Any thoughts on these specs and would I have to upgrade springs, lifter or timing chain??? By Edelbrock and price is fairly parallel to other brands.