Yes on Fan Shroud. Fan should be IN the rear edge (the round hole) not inside the shroud or behind it. Good idea to baffle/seal Shroud to Radiator to Back of Radiator Support then Front of Support to A/C Condenser if fitted.
Our 1971 B300 van was V8(318) automatic, no factory A/C. I bought a kit and installed it. Came with a MASSIVE steel fan that bolted in place of the tiny OEM fan of like 4 blades. It was so heavy that it acted like a second flywheel and interfered with transmission shifting.
Thanks to "contacts" I got a radiator from a newer Dodge cube van/440 engine, along with the shroud. No fan no clutch. Then another "contact" and a beautiful 7 blade aluminum fan with thermostatic clutch. Donor was a burnt GTO with 455 engine. That combination, big radiator, big fan, thermo (not viscous) clutch, and shroud, marked the end of all cooling problems.
Let me offer a tip: NO Flex Fans!!! In a car, OK. They flatten out at RPM and lighten the load on the engine for acceleration. In an RV, you're trying to pull a hill. You're geared down. RPM is up. Heat's being generated like crazy. And the Fan Blades are FLAT. No pitch due to the RPM, no air over the radiator. Fan's more of a Disc at this point, limiting ram air through the radiator.
