Yep as was said above, I installed one on my LA 318 engine. It replaces the thrust plate. I drilled one more hole in the tensioner so all 4 bolts could be used. use the old thrust plate for a template to drill the 4th hole...
Works great. I used one on my double roller allthough not necessary for those. You can also drill a small hole to keep the fuel pump cam lubed. (and I'm sure it squirts oi on the timing chain too! toolman