Best luck with it. What pressure cap are you running?
Big block in A body is always a cooling struggle.
I have not owned a Cold Case radiator but you can never underestimate to importance of blade placement, shroud and or clutch.
As I mentioned before, once I switched to aluminum 3 core with dual SPAL fans it changed everything.
Why stick with the old technology when you build and engine and trans and converter with upgraded components?