Griifin
You could also consider Cold Case as a more affordable dual 1 1/4” core option. I’m pretty happy with the Cold Case unit I fitted to my 410 SBM plus they’re a sponsor of FABO!
https://www.coldcaseradiators.com/product/1967-69-mopar-body-staggered-outlets?sku=MOP756A-7
You could also consider Cold Case as a more affordable dual 1 1/4” core option. I’m pretty happy with the Cold Case unit I fitted to my 410 SBM plus they’re a sponsor of FABO!
https://www.coldcaseradiators.com/product/1967-69-mopar-body-staggered-outlets?sku=MOP756A-7