You may be better to get a Clansman 320,
which is an HF set that can already do 27MHz, the 351 would have to be modified to do 27MHz.
The box is likely a distribution box, you need a 28V (24V) supply for both the intercom harness and the 320 or 351/2.
I can have a look when I get a chance to look over what you have. The ANR harness I have can have 2 radios and the harness but usually you have it on intercom and monitor the radio in the other ear, to transmit you switch to the radio and use the same pressel/headset your already wearing.
The sets below are the large format radios, that I would have assumed were fitted to the Stolly, the 353 is roughly equivalent to AN/524-VRC VHF and Clansman 321 = AN/106 HF
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