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The increase in displacement should make a good difference. Here is some verification: https://www.baileysonline.com/itemdetail.asp?item=537+32+05+01&catID=1866

The 460 cylinder will go on the 455.

Check to make sure that the connecting rod looks ok, and not an inordinate amount of play where it attaches to the crank. I'd replace the bearing where the piston attaches to the connecting rod. Be sure to do a thorough cleaning of the crankcase.