Amending clay soil?

I'd appreciate some advise on amending a heavy soil. Some suggest sand,
certain types
of sand, compost, gypsum and mixtures of these....

My soil is quite heavy. Compressed in a fist, it forms a solid ball.
It's black and breaks
apart, but doesn't drain well. I think it has a lot of clay, but isn't
all clay.

I was thinking about 4" of "builder's sand" and 4" of well decomposed
compost tilled in
well. Is this a good idea? The gypsum also seems like a good idea.

Thanks,

-Allan


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