Sorry it's radiators again

I see a lot of better cooling talk from guys using water pumps that out perform others. I would enlarge rad support opening to accommodate the 26 in rad like said. thermostat is a factor. 180 vs 195. read up. also be sure your hood has the factory seals there, that will air flow, shroud is a must, correct size pulleys.
sorry gas will boil and cause problems not related to rad. fresh air opening in hood may not be "factory" but it does help get rid of hot underhood air.
use correct factory fan. do not use the flex! for several reasons.