My SBC will eventually go into a '53 Chevy pickup if I can stop making stupid mistakes such as the following: I bought an unknown crank from a "friend" and had it turned. The shop that turned the crank didn't clean the oil holes in the journals so I cleaned them out and apparently either dragged up some dirt or made a burr on one of the holes. One of the rod bearings turned up with a nasty gash. I don't trust the crank so I bought a new Scat crank.

After removing the defective crank, I put tubing on the rod bolts and today attempted to install the new crank. I can't seem to do anything right these days and nothing went according to plan. Since I have never replaced a crank in an assembled engine, I am lost as to how to do it. The engine is on an engine stand, upside down with heads and intake manifold installed. I don't relish disassembling the whole engine but I can do if if that is the only way to install the crank. Help!

Any helpful replies will be most appreciated.

Starlight coupe