Its also a 6.2 L, it started off stock with good power, back in the day when I ran a 13.7 I had spent 300$ on a cam kit, 450 on nelson tune, 650 on a yank, 400 on longtubes and 400 on true track so 2200$ netted 341rwhp 323tq and a 13.7. Its not always how much money you spend if you buy the right stuff, gained 82 rwhp over stock.
Thats like me at SAR last year. Less than 1000$ in the truck and ran a 13.6 @ 106
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