I think 2100 cfm may be marginal to cool a 455 at low speeds and especially with the a/c running. I am in north central Florida, equally hot, and I had to go to a bigger electric fan to solve a hot running issue on my 79 T/A. I don't even have a/c but the original electric fans I tried wouldn't do the job; finally went to a Lincoln Mark VIII fan and car runs about 180 even on the hottest days. Not to say you might not have other issues but I would look at the fan situation for sure.
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69 Bird w/1970 400 block(409 cubes), #64 heads, hyd. roller, Q-jet by Jeff E., original interior, ps, pdb, th350, and 3.73 gears. Pump gas, street driven muscle. 3800 lbs. race weight. Best, 11.39 @118, my son's car.
79 T/A w/463, Scat crank, Eagle rods, Icon pistons, Lunati solid roller, 262/270, KRE 325 heads, Northwind intake, QF950 carb, full interior, ps, pdb, th350, and 3.73 gears. Pump gas, 3650 lbs. race weight. 10.60 @ 126 so far...
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