I've been trying to find a good answer on how much power a good setup in the 10 bolt can reliably handle.
To be honest the 10 bolt is holding quite well in a LOT of pretty high power applications as long as it's fitted with good parts. For the amount you'll spend beefing it up, you could swap to a 14 bolt though.
1969 Chevy RCLB C10 350/TH400 SOLD
2007 Chevy RCSB 4.8 4x4 LS SOLD
2008 Chevy RCSB 5.3 4x4 LT SOLD
2010 Chevy CCSB 6.2 4x4 LT SOLD
2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
2013 FORD CCSB F350 6.7 Powerstroke 4x4