just go to the wrecking yard and pick up a ford Taurus two speed fan for under fifty bucks (1993) and it will cool a big block Chevy but it is about five and a half inches thick at the back of the motor to the front of the blades, don't for get to get the relay for it or get a new one or wire up two regular relays if needed for high but I doubt that you would need it. if you get to crazy on the pull on your pulley look and see if it could slip the rubber part of it that they use for harmonics. your timing mark could be off when timing it.