Opinions vary on how much HP a 351 block can handle, most estimates are around 650 or so. Definitely a lot more than a 302 block.
If you go 30 over on the bore to 4.030, and from the stock 3.5 inch to 4.0 inch on the stroke, you will have a 408, which is about as big as you can go without running into other issues, like needing to clearance piston skirts and the like.
If you start with a Dart block you can go bigger on the bore, but now you're talking about some serious money. Of course you'd then be able to handle even more HP, maybe up to 1,000 or so.
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