349 CI on the cheap

Mad Dart,
You could put NOS to it without any problems, but the amount that you could use would be less, as the compression ratio is fairly high. I suppose that it would handle a 250 or 300 shot pretty well. And maybe more with stronger rods and pistons. Because the piston comes out of the deck so far that you would have to cut about .060 off the top of the pistons and this would put you near 10.5:1, with the pistons still being out about .015-.020. Then camming it properly for NOS it should make a very good street engine, and depending on how much NOS you intend to use, this engine could make between 500 and 750 HP and still be streetable.