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Big blocks and small blocks are actually different engines. Both can be bored/stroked to several possible displacements, but in general the small blocks can't go as high (go figure). A 427 would be a big block, although some aftermarket small block chevies (don't know about ford) can be taken that high as well. A small block would be smaller and lighter, but most small block parts don't breathe so well at displacements that large. The bore/stroke ratio may also be different (changing the torque curve characteristics).
$3000 is not enough to build a reliable 427. You can get a decent 350 for that money (if you shop around), but nothing special.
A 289 would need to rev very high to make power.
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