1980 Regal w/350 chevy...heating problem

[unstable]

Ok so I've had this heating problem since I put a/c. Right now I have a single core aluminum radiator. I have 2 16" electric fans one behind the radiator and the other in front of the condenser (i know it's not the best way to do it but meh). The car does fine if I'm on the highway with the a/c on. The over-heating comes when I'm on idle in the city with the a/c on. It will get to 210-235 degrees. It's just a basic stock 350 SB chevy.

I know fan shrouds make a lot of difference. So really I'm wondering what I can do to make a custom one DIY that's not expensive and non-metal as I don't have a welder. I was thinking of maybe plexiglass but would that be able to withstand the temps? Any suggestions will be greatly appreciated.