Underdrive pulleys and overheating?

Anyone here using aftermarket under-drive billet pulleys and if so did this cause over heating problems for you?

I have a 1969 340, 11:1, 508 lift cam, Nicely worked J heads, making right at 400hp. Running a 7 Blade Fan and fairly stout custom radiator that uses a HD Truck core and stock plastic shroud. Never had overheatng problems with this set up when it was in my 76 duster. Kept a nice 185 consistently.

I moved this entire set-up to my 73 Duster (Engine, Radiator, Fan and shroud), Only thing I changed was to go to Billet Pulleys (Under drive) (These - http://www.cvfracing.com/Chrysler-Small-Block-Pulley-Kit-ALT-p/scre1kit.htm ) and a HV water pump. Now it wants to run at 220+ when cruising around town (Maybe even higher but when it gets that hot, I take it home. Only putting a few miles on it at a time before it starts getting too hot).

What I am really wondering is if I change to an Aluminum 3 row radiator, would it solve this problem or should I just scrap those pretty pulleys that are not spinning that fan (And water pump) as fast?