318 driver - cam change or not?

The new link shows the specs for the stock replacement cam, it is .351/181 intake-.400/192 exhaust 109CL. Compare to an Elgin .398/194 Intake and a .420/204 exhaust on a 115 LSA. The base Edelbrock Performer camshaft is a .420/204 I/E on a 110 LSA on a 106 ICL. It works very well as package along with Performer Intake manifold, an Edelbrock 500 CFM, and Magnum manifolds on an otherwise bone stock 318 mid eighties 4X4 with 3.21 gears with 31X10.50 tires. If it makes a driveability and off idle torque improvement in that, I'm pretty sure it's good for a '73 duster, too.