Help cooling 408 stroker

I don't think that's enough cfm. Choices are get a Mechanical fan, and shroud, or get higher output fans, and an electric fan shroud $$$.
I put in a the electrical fan with a switch because it was heating up with the mechanical fan in stop and go traffic. I figured its not enough CFM but i have so little space dont know what to do.

I was thinking of getting a 2nd electrical fan as a pusher for the front side of the radiator and just offset both fans?