Would my Duster run cooler with an electric puller fan?

I've been looking around online for a shroud, and Classic Industries has one, but made for A bodies with a/c. I don't have a/c.
Cannot find one made for my car... maybe that's why seller didn't install one? I just got the car from Canada the other day, and
I guess they're not that concerned with 90+ degree days.
Description from internet:
Mopar SHROUD, RADIATOR FAN, BLACK, 22 INCH, INJECTION MOLDED, INCL DETAILS OF ORIGINAL PART, REPRO
An excellent reproduction of the 1970-72 A-Body 22 V-8 radiator fan shroud. Original part number 2998 325. Correct for all V-8 cars using a fan shroud including 318 with A/C, 340, and 360 powered Darts, Valiants, Dusters, and Demons. Injection molded with all of the details of an original part.

So it is correct for all v-8's using a fan shround including 318 with a/c, then it mentions 340 and 360 but doesn't mention a/c on those. I'm quite confused.
Does anyone have a service manual that shows a/c cars and non a/c cars used different shrouds?
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Many thanks to those trying to help me figure this out.