DO NOT, I repeat, DO NOT buy a "stock replacement" or "factory HD upgrade" (double roller) from Useless Zone. Cloyes used to be one of the best but not any more. I just did the one in my 78 Fury (318) and when I went to install the Useless Zone-bought Cloyes chain, it had as much slop as the original nylon cam geared one did. I went to Advance and had them order me up an Edelbrock "True Roller" in my case, anyways, it was a much better chain set. Much tighter (but definitely not "binding") less slop in the chain as installed on the motor than the Cloyes.. Go do a search on that forgotten "B" site that I see you on all the time from about 10 weeks ago and you'll see what I went thru when I did mine.