LeMans, "cool air" from under the car may not be as cool as you'd think. Air close to the pavement is hotter than that 2 feet up, and the Pantera exhausts some but not all its hot air from the radiator undeneath, too. Before you go to too much effort, get a couple of cheap temp sensors and find the cool spots.
The '71s had their air piickup in the right front as you propose, but the 72-up had the pickup 180 degrees from there below the left rear- both with a sheet metal 'choke stove' as part of the fast warm up system, so intake air was preheated by the exhaust manifolds!.