440 Engine Knock

Did you check the converter bolts first?
Thanks guys, I got some really good advice !
Its hard for me to see small particles in my engine oil after its in the pan , easier on TV shows. I m blind I guess
I drained 2 quarts of 8 quarts, and looked pretty clean , filtered it thru a paint strainer no obvious metal .
Cut Oil filter idea worked great and it was clean
Convertor Bolts- I had not thought of that and they were tight
My builder died and the shop was sold , only remanufacturer engines now.
Plus I assembled the engine , checked clearances ect..

Problem
600 lift Mech cam , 256 dur @.050
number 3 Cyl. exhaust valve had .160/in lash vs .028/in , what i set them too
I checked my lift with a Mitutoya(good) Dial indicator and the cam lobe was ok ,wasnt rounded . Inspected valve , seat, changed the push rod ,and readjusted . I use blue thread lock on the Crane roller rocker nuts , maybe i forgot to tighten ??