Ya, Thanks for that info. If the weather ever warms up around here, I will give a report on the 7.25 OEM steel crank pulley that I have on there right now. I would like to stick with all aluminum pulleys, so if the 7.25 works real good, I might try going to the 6.4 aluminum pulley you mentioned.
As a side note, I actually had to trim about 1/32" off the O.D. of the steel pulley I am using to keep it from hitting my existing water pump pulley. I should know pretty quick if the water pump bearing ever starts to fail.

My 34 ply ran hot. What I did in steps, was remove 340 pulleys and put on 360 pulleys, relocate trany cooler from bottom tank, to under the running board, and the thing that helped the most was putting on a 7 blade engine driven fan, not a clutch fan. That alone took 15 degrees out of the probelm. Also did that on another car and it did the same. Brass radiators will remove more heat than an alumunim radiators,

Just a Quick up date on this thread. Did the Route 66 fun run a few weeks ago and got to drive in just about all weather conditions over the 3 days we were gone. The big test was the first day when the temp ran in to the mid 90's. We were pulling a small trailer to add to the situation. Hottest it got pulling up a long hill at 92 degrees ambient with the trailer was 220. Level surface at the same temp it hung around 205. The little air direction scoop I put at the bottom of the grill seemed to really help at speed. Ran a little cooler at 65mph than 55mph. This, again, was with no stat in the system. We ran in to some 60 degree temps on the way home and the temp dropped below 180 at times. Obviously too cool. So, per many's suggestion, I put a 180 degree high flow stat in. I will be trying it that way in a week or two. Thanks all again for your many suggestions.

glad it's working out for you ! [i just love that color with the sun on it !]

Not sure if this matters, or has been mentioned, but some marine inboards use a 140 degree stat. Slows down the coolant but also opens sooner?

John, I have a double pass Ron Davis radiator in my Hemi Model A and have no problems in the AZ heat.