Well I think I might have a knocking issue. I got a set of 48p heads which came off a motor that blew the bottom end. I cleaned the head and replaced all the valve stem seals. Put motor together and now it's making this noise. I got the car non running so I don't know is this bottom or top end. I am running 20w50 oil. Car runs perfect it's just this rattle/knock I get on acceleration only when I left off the gas knock stops. The noise usually starts around 2500 and up to around 4-5k. Other than this issue car runs on all 6 and strong. Here a video. Any ideas? Thanks