New Cooling/fan question

i run the original shroud and radiator from my 72 truck,in my 85 truck,it has a 180 degree thermostat,mild cammed 318,it will never get over 190 degrees,even in a 105 degree day,and going down the road,its actually runs too cool,@155 degrees.It has the 72 trucks,4 blade fixed fan,that i know robs a lot of power,and is not optimal for cooling,but its what i had avalible when i stuck the truck together.One thing i did do that helped with cooling on this engine,i think was,to deburr the cooling holes in the block,and front timing cover.My 72 block and cover had a lot of mold slag in the cooling holes,so much that my pinky wouldnt fit in 2 of them,so i gasket matched all the cooling holes in the block,just like i did the heads and intake