I have the Durango. HotRodDave gave me the advice. I did the valve springs as well and took .020 of the heads. Still running good! My only complaint is that now I need to do headers and a custom tune!

70 Challenger
1960 Town Wagon P Pump 24v cummins project
06 Mega 3500 Drw 2wd
12 Durango R/T
18 Power Wagon
67 A100