Big block cooling issues

Hey guys, now that I’ve been putting miles on my Duster, I’ve found that it doesn’t like the summer heat of Georgia. When I’m doing 60 and 70 the car stays around 180°, but as soon as I get into traffic it’ll rise up to 220° and sometimes higher. It’s got an iron headed 440 with about 11:1 compression (if calculated correctly), a complete Holley sniper system running 15 base timing and 36 total, a Pro-Flow aluminum water pump housing, a Summit brand radiator with a 2.25” thick core, overall size is 27.5” W, 19” H, 3” D, I have two 10” 1000cfm electric fans attached directly to the radiator that turn on at 180°, I’m not running a thermostat, and I have an old plastic jug zip tied to rad support as a puke tank. No A/C.
I want to make a fan shroud but I can’t find any aluminum sheeting anywhere but at Lowes and they want $60 for the piece I need, and I don’t want to make a shroud if it’s not going to help any.
Is this radiator too thin? Would a shroud make that much of a difference? Should I get an electric water pump? Is Pluto still a planet? I have many questions and just want my car to run cooler.

Any input is greatly appreciated,
Thanks!