Hopefully they've made really significant improvements. I had a Zoom in my old 426 street hemi a long time ago [ 1970 ]. It didn't last long and pulling the tranny in a '66 was a PITA. I've heard good things about Centerforce, but I've never used one. McLeod seems to be OK although I did break a spring in a McLeod disc in the 'Cuda. I am using a Sachs now and so far so good.