New Fan and Thremal Clutch Advice

[kelz702]

Hello all!
I have a 72 c20 350/350. I'm having a bit of an over heating issue. Temp fluctuates in traffic but stays cool on the freeway. I'm looking to stabilize the temp by adding a 7 blade fan and thermal fan clutch. I've done a lot of searching but can find anything definitive.
One obvious problem is how far the fan sits in the shroud due to the long water pump. I was hoping somone could tell me if I would be able to bring the fan closer to the motor by adding a fan clutch with a shorter shaft. And if so, how to go about searching for one. Another problem is the clearance on the outside of the fan shroud. The alternator is set pretty close to the opening.
Please let me know if there is any other information you need to to help me with this situation.
Thanks in advance!
Kelz