460/560 front ends will NOT bolt up to the 300 front bolster.
The 300 is a "narrow frame" tractor same as an H.
Both the 460 and 560 are "wide frame" tractors up front, same as an M.
Really, there is no modern wide front that will bolt to a 300. When IH went to the 460, they used "bump-out" frame rails to accommodate the big 6-cylinder engine block, making the front of the tractor the same width as the 560.
The 350 was the last of the fully narrow frame tractors, and the factory IH wide front for those had 3-spoke cast wheel hubs.
If you want 6-bolt hubs, you will need to find a Schwartz wide front as Allan suggests.
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