351W Rebuild

I agree with stang_roty about a 393 being a good stroker...you can use good aftermarket 351 rods, and forged 302 pistons (stock 351 rods and 302 pistons work in the 393) and just try to find a good stroker crank. Make sure you get everything weighed/matched and balanced so there's less high end vibration. A 393 stroker is cheaper than most of the others usually and you can more easily find parts. the 393 cubic inches is including a bored .030" block.
If you want a bad street carbureted/naturally asperated 351+ cubic inch carbureted engine, chances are you won't pass emissions with the camshaft you'd want. You could use a cam meant for nitrous/forced induction specifically with a lower duration/lift so you can pass emissions and add nitrous to compensate at the track (the car will still probably be a monster on the street, but then again why compramise on something you're going to spend so much money on and want to use for a long time. One thing that you can do to not worry about emissions is get a PO box in a non-emissions testing county and you can pickup your Department of motor vehicles stuff there, or you can have the post office automatically forward stuff to your house from that PO box. You won't have to take emissions because you'll have a non-emissions area mailing address and the $7 an hour workers at the DMV won't care...i know people that have done this. just some more ideas...