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I just finished installing a rebuilt engine on my 73 mach1 and am having cooling problems. Engine is 429 stroked to 528 and probably is making over 650hp. I have a bigger than stock cam (254/260)so running a bit advanced timing which probably makes it run hotter. Factory radiator, no thermostat ( I am in south Florida so cold starts not a real issue), radiator was rodded. All new hoses, 15lb cap. Dual 11 inch fans 2800 cfm total. Fans start 10 seconds after key on and both run continuously. 50/50 antifreeze and distilled water. C6 transmission with 2600 stall converter, but transmission has separate cooler- fluid not running through radiator.  Running 230 after 20-30 min In town driving. Have not driven on freeway yet. I suspect I need a bigger radiator, the make bigger fans, but I don’t think airflow is the problem. Any suggestions on a good radiator for this application. Car is street car with 3-4 runs down the quarter 4-5 times a year. Could timing be enough to make it run this hot? 18 initial/40 total ( I know total is high but it seems to do fine) I can back down , but then it doesn’t like to idle very well/stalls in gear.