I've had good luck with a Cloyes "true roller" on a BB. The more expensive one. I did have to buy a -.010" version to get it good and tight with my align bored block.

On a SB, I believe the tensioner requires a stock style chain. Hi po "true roller" types tear up the tensioner. It wouldn't hurt to price a stock replacement chain from your local dealer. I "think" length was the same through the years so a replacement magnum chain should work. That has proven to be a durable piece.

Hope others will confirm the fit.