Frankly, I don't think there's anything that can be just bolted in without changing anything else.
The 504 and 340 are kind of red-headed step children in the IH family. Basically, they are a punched-out Super C engine bolted to a 460's rear end. The 504 added frame rails similar to what you see on a 666 or 686, not the "bump-out" rails on a 460 or 656.
I think the C221, and for that matter a C263, C291 or C301 (all the same block externally), with a 460 rear engine cover, would bolt to the 504's bell housing. It might work, but my concern would be fitment between the frame rails. You'd have to find a 460 and measure.
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