newly built 416 getting warm

I'd get it recored to a 3 core...or get a Mancini alluminum unit. That's what I bought, yet to be installed. You can then get some black radiator paint and spray it. It will look as stock as possible and be a nice alluminum unit. Either way would probably work. I can attest the custom built Mancini units are very nice (but pricey).