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Lean...
Or timing ? 
These 2 guys are right, it's the tune up, I'd bet a weeks pay on it.
You don't need to modifiy the cooling system, you need to run the right tuneup, I'm sure.
Challenger 1 - Will you be sending that weeks pay via Paypal or check???...  
Well, regardless that the radiator was new, and no matter that we flushed the cooling system - apparently the 1,000 mile trip to MMW in St.Louis knocked enough rust and debris loose in the engine/cooling system that the radiator was plugged up.  After trying EVERYTHING else, I took the radiator back to the shop and told them my problem and they said they would flow check it. Yep, sure enough - they said even though it was cooling, the flow was terrible. A $21 radiator flush and I'm back in business! 
WHAT a lesson learned!
Thanks for ALL the help and ideas you guys gave me (and all of us here on Moparts), I think this will be a valuable thread!  
Wile E. Coyote
Super Genius, Lover of FCA US LLC Products
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68 Road Runner (440 4-spd), 71 Superbee (383 slap), 71 Charger 500 (383 4-spd wA/C 1of 182), 72 Imperial, 74 Charger SE (440 sunroof), 84 D350 Crew-cab Dually (440), 75 D300 Dually Tandem (318 4-speed)
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