Does A Big CI Stroked SB get to a point where It is hard to keep cool?

I don't think the cubes are hard to keep cool. I ran a 344" small block (.030 over 340) in my car and now I have a 436" aftermarket block motor in my car and it runs hot. I was able to solve it with a dual pass aluminum radiator. I notice the Ritter block has very small coolant passages for the water pump. I think this makes my stroker harder to cool.