Do the newer magnum style thermostats flow enough

high flow t stats are like high flow cats, mostly bullshit. You can buy a performance t stat for a magnum, but should be same as regular. Are you sure you have correct water pump installed? Magnums flow backwards of LA. Also, are you sure you dont have a cracked head, that will make em run hot. What kind/style of radiator? Is it heating up mostly in traffic, freeway or doesnt matter? Do you have a fan shroud? How about a pic of your combo?