No a large journal crank will not fit your block. Thats what makes them stronger is the larger journals. You just need to find a complete 504 from the models you just posted. This will give you the later screw in injector heads also. Your smaller crank has 2.75 rod journals and 3 inch mains. The larger crank is 3 inch rod and 3.5 mains. Thad
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