Overheating 360 new engine
With or "Without" that aluminum box shroud the way you have it configured, you are only moving air though 1/2 of that radiator core.
Those plastic fans with their plastic shrouding "Will Not" allow you to pull air from outside their main diameters. So of course It is going to over heat.
Do the 9" x 11" paper test on the front of the radiator with those 2 electric fans running.
4 sheets of paper on the front side of the radiator, see which 2 sheets stay tight to the radiator and which 2 sheets fall off. This will show you where the air flows through the radiator core.
With or "Without" that aluminum box shroud the way you have it configured, you are only moving air though 1/2 of that radiator core.
Those plastic fans with their plastic shrouding "Will Not" allow you to pull air from outside their main diameters. So of course It is going to over heat.
Do the 9" x 11" paper test on the front of the radiator with those 2 electric fans running.
4 sheets of paper on the front side of the radiator, see which 2 sheets stay tight to the radiator and which 2 sheets fall off. This will show you where the air flows through the radiator core.