The worst case of s you take the entire engine apart and clean it up, put it back together and install the new cam and go.
That route sucks if you have a failure. “IF.”
The other thing with the cam as 273 was pointing out is the duration (actually what is really important, the overlap) dictates where the cam is going to make the power. It should operate daily well in the listed rpm range given by Comp Cams.
I’ve noticed all the kits available for a 318/390 stroker and they vary a little bit. The idea of one lasting only for a short time has more to do with your right foot being to heavy. A cast crank can take a 600 hp build easy enough. So can a cast hyperutecic piston. If you’re in the street and plan on a car nine making 525 & less, it’ll last a long time unless you’re constantly pounding the gas pedal. If you do that, even a forged crank and piston set up die an early death.
The kits available are normally really good quality packages. It’s the abuse they suffer that shortens there life span no matter what there made of.
What is your power goal? Or track ET goal?
What transmission, rear gear & tire size do you plan on?