Stroke a 318

I have a 318. I made a huge mistake and left a rag in the motor and started it up. Needless to stay, it tore the rag up and it went through my motor. I found out because I changed or upgraded the distributor. Since I have to take my block apart, now to blow out all the oil passage lines, I would like to put in a 4 inch crank, is there anything special I have to do to put in a 4 inch crank? Any helpful? Suggestions would be greatly appreciated. I found a lightweight crankshaft on Summit racing for an internally balanced motor. What parts will I need to complete this?