How about the silvolites? Or just the stock pistons? Will either of those last? Nitrous not happening any time soon, maybe for christmas. I would like to get it together before summer is over. Camshaft is 290 advertised. Not sure what actual is, rough measure on v-blocks with degree wheel(makeshift) puts is somewhere around 250*. I got all the head parts from Tom Lowe, ready to take it to the machine shop, just trying to make a decision on pistons. My block was already .060 over, so i went to pick 'n pull and got an untouched 250 block so I can start fresh with the block. Looking for suggestions.