That is a 18.5" dia. fans from a Cadillac (thats all I can get on the #'s). Either way something is wrong. Those are most likely the wrong motor mounts for a bbc causing the engine to sit higher and tilt to where the slightly oversized fan than what should be on there is hitting the hood. Easiest solution I can see in the realm of cooling is electric fans, but still I don't see a complete picture here that I can judge on anything. Honestly, if the motor is that tilted, then you might want to look at taking care of the problem at hand and get the drivetrain in the right position. It's ahard to tell what the fix is here. Maybe the trans mount and crossmember is a problem.