I went with a copper brass 4 row triple pass from US radiators for my 572 hemi, they actually have a higher emissivity than aluminum. $895 special order through classic industries.

Now to get the car finished so I can try it out.

I put in a Champion in my stroker jeep, runs fine at low speeds, but hates the highway above 60mph and 105 outside air temps...may go back to copper brass on it too

1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!