I am guessin you dont just want a good sounding cam? you want good performance to I would hope...
I would look into something with around a 220 duration on a 112 LSA, Something like the TR/TSP220 or 224 both are proven cams and will sound good in the 4.8.. I wouldnt go any bigger than a 224 tho without a bigger converter..
Those are both good cams. The 220 is proven on the 4.8s and 5.3s
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