I have a 67FB with a 69 351w. I had to move the outlet on the radiator to the passenger side. Now the car overheats. I purchased a shroud, but now my 18 clutch fan will not work and neither will my 17" 4 blade fan, no matter what combination of fan spacers I use. Anyone have this problem before? I saw Summit had a universal 15" clutch fan, thought I could use my clutch from my 18" fan with it, or I could get a 15" 6 blade flex fan. Any suggestions? thx...