what is the best small block and why ?

GATORS340 said

318 with 360 heads makes it a wedge motor but the crank won't hold up.

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Incorrect, all of MoPar "LA" engines are wedges.

If your crank didn't hold up, it's not the cranks fault. Ethier poor machining when last rebuilt or bad oil pump in a car without a idiot light or gauge.