What brand radiator are you guys using to cool your 440?

I won't say you're lookin at this the wrong way, but you're leavin a lot out. That's probably a good way to put it. The radiator of course is very important, but you should be looking at the cooling system as a whole in regards to what you want to do with your car. For example, I've seen some drag cars with $1000 dollar radiators that had problems over heating. On the flip side, I've seen 9 second cars that run cool as a cucumber using stock Chrysler radiators, so it ain't all the radiator by a long shot. The advice I would give you is, don't try to reinvent the wheel here. A lot of times the farther away from stock you get with a cooling system you get, the harder it becomes to keep it cool. There is so much out there on the market and a vendor will tell you whatever you want to hear to get your money, so it's tough to find what works and what doesn't. Normally with cooling systems, staying close to stock works for most everything. There are exceptions like high flow thermostats and high flow water pumps, but by and large the best successes usually come from cooling systems that remain pretty close to what the factory used. Especially with the influx of chinkesium aluminum radiators, you may get a good one and you may not. Lots of times guys chase an over heating problem and say "the radiator is new, it can't be that", when all along it is a crappy made radiator. New and good don't have the same definition in the dictionary and never have.