Rusty that intercooler will work. Anything is better than nothing and even a small core that is directly in the path of airflow will pull heat out of the charge. I’d like to see more surface area but you aren’t going to be making more than 300hp so that will be sufficient.
Look at the size of the intercooler on the 4 cylinder 1980's mustangs. I think it was no bigger than that one, but it was mounted at the top of the engine compartment, where I don't think it got as good air flow.