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To fix your cooling problem:
If the underside of the new nose is open now, then you might try a front spoiler just at the line original front bumper. If you can get hold of worn out racing slicks or dragster slicks, you can cut out the "tread" area out and end up with a nice piece of stiff rubber the width of the original tire x the circumference of the tire long. Make the spoiler almost touch the ground, it will grind away where it is too close. The spoiler will make air go up under the nose more. If that is not enough:
Pardon the breathtaking craptacity of the attached gimpshop.
You might consider Either cutting out the black area, or putting scoop underneath as shown in the red line. Which ever is easier or looks better, but not both unless you enjoy the extra work. In either case I would suggest completely sealing up the underside of the nose if you have not already done so, a panel which ends at the lowest point under the original front of the car. This way all air let in by the red scoop or black hole must go thru the radiator.
The black area hole is probably at a stagnation point at the nose of the car. The scoop might stick down about an inch or less. You will have to stiffen and reinforce the scoop since the air forces on it might be significant. The lower surface of the scoop would also be the lower surface of the panel that seals up under the nose. If you get okay cooling with the black hole, then you might consider making an internal duct (rectangular cross section is ok) from the hole which expands to fit the radiator size exactly, and is sealed to the radiator to prevent leakage. The duct will improve efficiency of the radiator, so it will help in you are marginal on the black hole size. If you want it to look cool, make a nice 2" radius around the edge of the black hole as it transitions to the duct. (this is the hardest part of the job)
Good luck!
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