I have a 5.9 out of a 2000 durango, has the mopar perf carb intake, the ports have been gasket matched, the bowels cleaned up, the cam out of a 380 horse crate engine, a 650 DP carb and a set of 1 3/4 headers, a really tight production torque converter, and 3.90 gears in a 3600lb ebody that goes 12.80 in 100 degree heat