Beta makes some so-called 'drop in' replacements for the A4: 16 a4 Beta Marine US Ltd. Distributors for Kubota based marine diesel engines and generators for sailboats, yachts and trawler boats.
They have models ranging from 14 - 28 HP as A4 replacements. Your choice of propeller might influence which HP engine you want/need.
If your A4 is not in terrible condition I'd suggest you try to sell it here: For Sale - Engines and Engine Parts - Moyer Marine Atomic 4 Community - Home of the Afourians
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