408 breaking up

I believe that motor has the 280H in it or something close to those specs. Its not a lot of cam for a 408.

Isnt' that cam something like 230/230 and 480 lift?
That cam barely turns 5600-5800 in a 340/360. This car is feeding 15-20% more cubes

I bet the car would run better shifting at about 5000 and running it through the lights.