I had a similar problem recently, I flushed the cooling system 5 times, then filled it with 70-30 mix (70 percent watter 30 percent A/F) and now I run 15 degrees cooler. SInce I don't have a separate tranny cooler, I put in new lines (the old ones were in bad shape) and slipped and insulator on the lines, they run right by the headers.
By the way I run a Taurus 3.8 fan at low speed with a 180 degree t-stat and a 175 degree fan switch.
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Can do the talk, can't do the walk......therefore need deep pockets 
Injection is nice but I rather be blown 
If you got it flaunt it, if not fake it (Snoopy)
Original 1977 Firebird / Welded tube frame connectors
TH350 with shift kit / 400 bored/stroked to 455 by PDude
OCD=Waxing and polishing your oil filter
SICK=wetsanding your exhaust pipe
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