Been having a rod knock for a over year, trying to nail down a solution. Oil analysis came back from blackstone labs (see picture attached). Looks like a good bit of iron content , so the crank is probably scored. Definitely needs rod bearing replacement. Two options: 1) Replace just the bearings without having to pull whole engine (less $ and labor). Do these engines suffer from a scored crank journal if the bearings are new, or can they survive and tough it out? 2) Replace entire shortblock with a upgraded high performance option and use rest of existing engine. If the issue is rod bearings and crank wear, would the rest of the upper part of the engine be OK to use married with a beefed up short block? What do you all think?