To expand on gtoformula here is what I have and run 170 all day long.
Manifold Vacuum with Vacuum Advance
9 initial
48 cruise
33 WOT all in at 2500rpm
Electric fans start at 180 and I have a 170 Thermo. I have a feeling your factory timing specs use ported vacuum and very little advance timing making the car run hotter than it should.
Get the shroud and do searches on here about the fan shroud, many aspects to keep an eye on concerning fan and shroud clearances/distances etc.
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69 GTO Convertible, 4000lbs
462ci, 606tq/569hp - 93 oct @ 34 deg (207psi)
11.7:1, KRE H Ports, Lunati HR 282/290 w Johnson Lifters & 1.65 Scorp, E30, EFI, Holley HP + Dual Sync, 12-1 Crank Trig, 120lb Inj & 1000cfm TB, Torker II EFI Int & Rails, PTC 10", Rock Valley SS Tank, Dual 450s, Aerom EFI Reg, Aero Front & Wilwood Rear Disc Brakes, Dougs 1 7/8" & Borla Pro XS 3", Alum Rad & Dual Fans, 12:1 Box, UMI Arms & Viking Berz Fr + Rear CO Shocks, Hella UP5.0 Vac Pump, 12 Bolt, 3.73, 33 Spline
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