I believe the facotry mains for a 455 are 3.25" and the 400 are 3.00". I also think that a storker kits also has shorter connecting rods and does something with the skirt of the piston.
I'm guessing on the piston work... Or, you could put a roller cam set up in the 400 and make 400 street hp pretty easily.
Have fun with the project. I have my 14yo son to help me out and we go to all the events together. Soon he'll be driving!
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