I finally got around to testing this. No changes to the motor at all for this test. 30* C day and I took a 40 mile cruise with the AC on high. Temp hit 210 and was confirmed by my IR temp gun. I taped off the openings in the dual snorkel hood and drove the same 40 miles home at the same speed with the AC on. I saw a 25* drop in operating temp and the AC was noticeably colder on the trip home. The unsealed scoop definitely has a negative affect on airflow through the Rad.
Cley