I have a 71 Challenger with a 26” 3 core champion radiator. When I bolt the OEM shroud to the radiator it leaves a 1” gap. From what I’ve seen and heard you also want your clutch fan to stick out half way to help cool the car down more. Is there an aftermarket shroud I could buy to help fit better on the radiator or would I be better off having to buy a new radiator. The car stays around 195 degrees now but kinda worry’s me in traffic. Any help would be great!

A 1" gap where ? I can see the shroud is standing off the radiator, and can't see the fan, which I assume is buried in the shroud.
Yes, 1/2 way is optimum, but likely not 15 degrees' worth.
Options:
Modify your existing shroud to fit the radiator closely, which will also improve fan/shroud positioning.
Find another shroud that's shallower - junkyard or universal-type.
Speed up the water pump & fan with a smaller pulley.
Also, you can cut back on the anti-freeze to 25-30% in most climates.
(This assumes good condition, proper tune)

Looks like aftermarket aluminum pulleys. Is the water pump being under driven?
What fan are you using? Oem or aftermarket? Clutch fan? Flex fan?

EDIT - On rereading your post I see you mentioned clutch fan.

I have the same radiator and a factory shroud in my Satellite. I cut some quarter round "filler strips" from black closed cell water pipe insulation, and glued them in with weather strip adhesive. Take your time and it will look pretty good and seal the gaps.

I had the exact same issue with my '70 Duster 360 combo, and just took care of it yesterday.

I went to Home Depot and got a black cement mixing tub for about $5. The plastic it's made of is flexible enough that it follows the upper curve of the shroud easily. I cut a strip wide enough and long enough to cover the gap end to end. Screwed it down into the shroud with some stainless machine screws. This left a very small (1/8") second gap due to the weld along the top of the radiator, so I cut another strip to cover that. Probably could have left that little gap alone but it bugged me so I covered it. The pics tell the story. Obviously not a show car or factory restoration.

Here's my solution for the same problem on my Cuda with
the same 26" Champion. If you look at the bottom of the photo
you can see a side profile of the material I used.

I used some aluminum angle and used rivets to attach it.