What camshaft spec for 425 hp
That’s why I said you’ll need to modify the accelerator pump arm with the blue cam. From the pictures it looks like you don’t need to do that with the green cam.
With the blue cam you have to make sure the flat on the accelerator pump arm is flat against the flat on the pump cam. Otherwise you are giving up all the lift from the blue cam. And you’ll have to most likely tighten up the adjustment spring.