85 403cutlass

at first i had a 180 t-stat and i put a 5spd in it and i checked the heat from the hedder with a raytec and it will max out the gun [888 degrees] I think its running lean i have tried to ritchen the idle it dident seem to change i think i need a 750 carb?

i have a olds 403 with 330 heads two eletric fans 10&16" 3 core raidiator no t-stat 600 holley timing is at 16 btc engine has .040 overbore and runs hot 210-230 heads & block have been magnafluxed. <div class="ubbcode-block"><div class="ubbcode-header">Code:</div><div class="ubbcode-body ubbcode-pre" ><pre> </pre></div></div> please help