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Why not cast your own engine block.DMD Australia - Austin Healey 3000 Aluminium Engine Blockhttps://healeyfactory.com.au/services/dmd-australia/dmd-aliminium-engine-block-pattern-making/https://youtu.be/-AbFqU9JKUI
I'm very curious what you've been powering with your engine, that you've accumulated the thousands of hours on it necessitating'a few' rebuilds? Please use at least 5/16" or better yet, 3/8" plate steel, and let me know when the kits are available, and I will place an order. I have the welding equipment and Horizontal Boring Mill required to complete the work.
FYI,I think you can buy a block from Gary "dieselgman" on this forum. Send him a PM if you are interested.He has engines and broken down components.You may be able to buy the block and make everything else yourself.(If that's a road you wish to take)cheers,veggie