Radiator construction

As i see there is a group of very knowledgeable people here, i would like to ask a question.
Im having a cooling issue with a non mopar,custom built rad.
The cores are staggered.
Three rows, but one is offset and i think its screwing with the airflow?
It should cool a small block without issue and it does not.
Off the top of my head I wish I knew something about a staggered design, because I don't, I don't understand why one would be necessary.
What vehicle is it, like what's the front end look like?