heating up a little more

One other thing, it's hard to tell if you have a passenger side exit on your water pump that is made for the A Bodies.

440source has made these in the past, some of the first ones that came out had restrictions in the exit port at the lower hose. Think they have their design fixed now. But if you have a flow problem there that can make it overheat.

20210331_174130.jpg

Think some folks even machined out the restricted aluminum lower hose opening.

Headers dump a lot of heat into the engine bays, and big horse power makes a lot of heat too.

That Special Dessert Cooler Radiator might be just the ticket for your application. Then you can sell your aluminum rad to someone with a small block, get some money back, and everyone is happy.