Slant 6 shroud in my 360 barracuda.

After much debate I decided to use a fan blade over an electric fan.

The only available shroud I had was from a 76 slant 6 dart.

I fabbed up some brackets and put it on as best as I could make it fit.

I still have a gap at the top and bottom of the shroud so I need ideas as to what I should use to cover the gaps between the radiator and shroud.

I was thinking some flexible thin sheetmetal or something similar.
I will paint everything semi flat when finished to make it look uniform.

I took it for a test drive and I stayed nice and cool the whole trip.
I think the fan is sucking pretty good because the blades were nice and hot to the touch after I shut it down, but I know I can get some better cooling out of it if I fill those gaps in.

Any ideas?
Keeping in mind, I am not extremely concerned with looks as I am in functionality.

Yes, ultimately I want to try to find a custom fit shroud that will fit this radiator perfectly, but for now, I am having fun in the garage playing with stuff.