I'm am wondering if I will require better coolong than stock with this engine.
355, AFR 190, Superram, LPE 219, 10.3 to comp, Coated headers.
I live in the desert so it gets pretty hot. My mostly stock 87 GTA 350 won't over heat now but would that engine run hotter.

thanks

 

It might run slightly hotter but that all depends on your cooling system. When i swaped out my 305 for the 350, i put in a new radiator new hoses,water pump 180degree thermo and a fan switch that kicks the fan on at 200 and off at 185. It runs way way cooler than the 305. Put a lower temp thermo, get your fans to turn on earlier and check the rest of your cooling system. If you feel its neccesary upgrade your water pump but i doubt youll need to. Hope this helps