Roller camshaft conversion from a Vortec L31 5.7 liter engine is what I'd personally do, if the block is able to be converted to roller camshaft. If the block has a fuel pump block off plate bolted in, then the block is likely a good canidate for a roller cam conversion. If the fuel pump mounting is cast completely closed, (no hole for a fuel pump push rod) forget the roller cam option.
If I couldn't do a roller cam conversion, I'd go for option #3. I would use a re-ground camshaft to save a few $$. I get my re-ground performance cams from Oregon Cams http://www.oregoncamshaft.com/ I can usually get flat tappet cam, lifters, and timing chain with gears set for about $110.
dave w
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