Lt1 bottom end, how much can they take?

[Batman]

For the extra few bucks I'd sit down and get a custom grind cam from a pro. I agree with suicidal that that is in the ballpark of what I would say but it is probably cheaper to get a custom ground then invest in 1.6/1.7 rockers (although I have had very good luck with the GM 1.6's and they don't break the bank). Biggest thing with the cam is to have that extra exhaust duration to get that pressure out of the cylinder bores as fast as possible. As for the boost I'd seriously consider a forged crank if you want to do that and 20 PSI you may blow the block