Another Mopar Off My Bucket List - Barracuda Fastback
Seriously, I would leave the 6-71 on there if it already fits.
So the car will only have 800+, the rear tires will not hold it down regardless of which one you use.
I have a baby 144 blower on my vette, and I was hell bent on keeping my AC so you talk about no room, there is less than an inch from the front cross member, had to add a huge fan spacer to clear the blower belt, and cut the **** out of the fan shroud to get everything to clear.