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Dragon 462 , I had the same problem with my FE 390 . I took it to a speed shop and this is a list of things they found,
The March pulley's are to much of and under drive .
The radiator they came with the kit package was just to small , they like to rate them by the HP of the engine , a radiator manufacture I had on the phone Question that logic.
The radiator was replaced and moved forward and upright, it was tilted back.
Replaced the Mickey Mouse fan that came with the kit with a 2002 Viper fan assembly , cost 189 from Chrysler and is a two speed , a real bargin for the price , it comes with flaps on the corners that close at slow speeds.
I run a 180 stat. and I have solved the problems . Good Luck.