MoPars purple cams are pretty good. While not taxing and hard core race cams, they do get the job done. I’d mic the lift at the rocker to see what you have in there. Adjust one rocker to zero lash for the test or add the lash in later.
If, for say, it’s a .590 cam, it is listed in the speed tips section for use in the 10 second bracket range. The vehicle weight and such being a big determining factor of course.
That EZ head is pretty good. Though I’d look into a good stiff rocker arm and check the valve spring pressures after sitting for a while.