David,
I've just looked at some of the photos you posted and your air cleaner sits up quite high above the flange on top of the carby, whereas some original style air cleaners start below the flange because the bottom of the air cleaner is recessed.
Hopefully the attached picture of mine will give you an idea of what I mean.
I believe there is a good chance a standard Mopar air cleaner for the A (LA) series 360 engine will fit under your bonnet, or should I say hood!
If you buy a secondhand one on eBay, if it doesn't fit you can always sell it again on ebay
Kevin