dont tell anyone but the buick has an LS in it with twin turbos and a carburetor... i have a diaper, when i went to install it, made me think about a pan. maybe i need to customize the diaper but taking up some slack, using a few stitches to sew it.
Aside from lift, which could be minimized with an air dam under the radiator support, you're blocking airflow out of the engine compartment. Likely leading to overheating. In the end, I don't see how this is going to "contain" any oil leakage. It'll just roll out the back or out the sides by the control arms.