Overheating race car

I think 4 core rads are highly overrated - they have trouble getting out of their own way. You might consider a 3 core that will offer quicker air flow through, if that makes any sense to you. I have a friend that runs a 426 hemi SS/A (about 550-600 HP) and he uses a 6 cylinder rad. I think it's a combination of air flow and retention time in the rad for the air to be able to cool the liquid.
Just my two cents worth.................
Daryl