you can find a smaller diam. blade for the clutch. they have 16/17/18 ect...
I happen to find the size i needed at the u-pull on a striaght 6 amc hornet 7 blades and fit the inside the stock rad shroud on my truck.
if the rubber motor mounts flex much it might get a water leak.
measure the diam. of the fan blade end to blade end,I will check to see if I have a smaller one in my junk pile.
how close is the clutch from the rad core?
are you going to run a shroud?
you can find shorter longer fan clutch shafts as well when uprading.
looks like it is moving along bolting together.