Found my dads original 1971 duster!

Demonx2 said
The Hayden "shortie" #2947 verbiage says it is 2.7" tall. So that would be taller than yours if it's only 2.25". Hmmm....

As for driving it to the alignment, keep the cap on and drive it. If it does get too hot, pull over, idle it for a few minutes, then shut it off and wait for it to cool.

You'll want a 7-blade fan like was shown in a prior pic. So perhaps place an ad to see who might have one for sale.

Ya thanks guys. Thats the plan. I’ll leave early and keep a close eye on the temps.
Ya, Im at a loss as to how my fan won’t fit. The only thing that makes sense at this point is if he mounted the engine too far forward in the car, or if water pumps come with smaller “snouts” on them. Although I measured one at moparts today and it was same as the one that’s on my engine. No clue at this point