There have been several changes to the phasers over the years. Maybe the Comps will work fine on the early version but the later versions of the phasers have a different way the springs are held in place. Hell the tool that comes with the Comp's doesn't even work with the later phasers. The limiters are about 1/4 inch thick and that make the bolts that go through the gear and hold the springs 1/4 inch shorter. I had a pair of the newest phasers on mine and the limiters were properly installed.
What happened with mine is the trans didn't shift to third when it was supposed too, so I hit the rev limiter. I guess this extra load on the design was too much because the pass side phaser spring came loose and got caught in the chain. This caused a piece of the spring to exit the cam cover, making a nice hole and the cam jumped time so the valves contacted the pistons.
I think if I had longer bolts, to better anchor the springs, this wouldn't have happened but I am not sure. With my new engine build I went with the Livernois limiters and the same cam and valve train setup. I haven't had any problems with this setup.