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I'm running a front mount Huron speed AC turbo kit and was getting hot on 90+ degree days. I notch the core support and slid a big *** BeCool radiator in the near stock location and haven't had a problem since.
I switched to an LT1 radiator with my procharger setup and it dropped the temps. All the procharger stuff was used (single fan, duel intercoolers....) Of coarse I was not running a 408 either so that will probably change results for you. I did have a thread a while back about the swap. I had taken pictures of both radiators side by side and the LT1 is a thicker unit. That would be a cheap option however you will probably need to spend some money on a nice radiator and some good fans.
I been fight overheating for ages on mine in this hot weather. 408 procharged. Have a be cool rad and notched the support to fit in the stock location. Still overheated. Few month of being pissed off with it put a pressure tester on and the cap was bad. Now it says it's get to 232 and slowly rises but I think the temp sensor is going so going to put in a 180 thermostat at the same time and it should cure it.
Also I have 2 puller fans with a custom made shroud to force the fans to suck through the radiator.
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Cooling setup needed, overheating 
