Mopar 400 block 8 sleeves

Hello everyone!

To start, I am in Europe and getting a 400 block here is near impossible... Importing one from USA is around 1500-1800$ after all the shipping and taxes...

So I had an idea to sleeve it in all 8 cylinders and re-use the pistons that are already in it.
Is there anything against what I plan to do?
I talked to 440source about it and they told me its not a bad idea especially given that it will cost me around 1000$ done with Mahle sleeves.

The pistons that are in it will be sent to line2line coating for ceramic coat on skirts. Normally they media blast them to get better adhesion of ceramic coating. This will give me a chance to see how good their coatings really are. The block is currently .030" over and it will not clean up at anything but .050"

Any feedback would be nice before I start putting money into this idea ;-)

Thank you.