Radiator dimensions abody vs bbody

Darter6 said

I put a 76-80 F body, same as the B of those years in my 63 Valiant
Had to trim some of the mounting flange on the battery box side.
Like HemiSSDart states,had to drill new holes for the flange,but only on one side.

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I saw this thread and wanted clarity on the early A fitment for a 65 b body radiator. I have a chance to buy a 4 core b-body radiator part no. 18398 that was redone and never used. I have a 65’ barracuda. Looked everywhere for what I’m asking. Help would be appreciated. Thanks.