DJD has good advice, run full time vacuum advance which helps your engine cool at idle. 10 initial, 10 vacuum advance and mid 30s total.
The heat transfer hardware sounds good, I am not excited about the Black Magic fan or the flex fan you descibed.
I have tested the black magic fan and it does not put out the CFMs that they claim. It is a marginal product at best. It won't cool you in your location in the summer I can tell you.
My suggestion is to buy the best electric fan for your application which is the Spal 16" hipo fan. That should be enough for your application, but if you have air, and I suspect you do or want it, or just want more CFMs , buy the twin Spal 11" units. I will assure you that will do it.
If you are a junk yard guy...look for Lincoln Mark 8 or dual windstar fans. They are good airmovers as well.
If you don't have any space at the top of your radiator in the tank, the radiator will commonly push coolant out to a level where it becomes operational, this is especially true if you fill then run hot then push out coolant then fill again etc.
How much antifreeze are you running. Too much antifreeze will PREVENT GOOD COOLING AND IN FLORIDA, ALL YOU NEED IS ANTICORROSION PROTECTION.
More on cooling at my cooling tips forum at www.inccn.net/techforum.htm
ConceptOne Pulleys and Brackets
[This message has been edited by HOTRODSRJ (edited 03-15-2002).]